Package org.apache.ws.commons.schema

Source Code of org.apache.ws.commons.schema.SchemaBuilder

/*
* Copyright 2004,2005 The Apache Software Foundation.
* Portions Copyright 2006 International Business Machines Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package org.apache.ws.commons.schema;

import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.Vector;

import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.ws.commons.schema.XmlSchemaCollection.SchemaKey;
import org.apache.ws.commons.schema.constants.Constants;
import org.apache.ws.commons.schema.utils.NodeNamespaceContext;
import org.apache.ws.commons.schema.utils.TargetNamespaceValidator;
import org.apache.ws.commons.schema.utils.XDOMUtil;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

public class SchemaBuilder {
    Document doc;
    XmlSchema schema;
    XmlSchemaCollection collection;
    private final TargetNamespaceValidator validator;
    DocumentBuilderFactory docFac;

    /**
     * Schema builder constructor
     * @param collection
     */
    SchemaBuilder(XmlSchemaCollection collection, TargetNamespaceValidator validator) {
        this.collection = collection;
        this.validator = validator;
        schema = new XmlSchema(collection);
    }

    /**
     * build method taking in a document and a validation handler
     * @param doc
     * @param uri
     * @param veh
     */
    XmlSchema build(Document doc, String uri, ValidationEventHandler veh) {
        Element schemaEl = doc.getDocumentElement();
        return handleXmlSchemaElement(schemaEl, uri);
    }

    /**
     * handles the schema element
     * @param schemaEl
     * @param uri
     */
    XmlSchema handleXmlSchemaElement(Element schemaEl, String uri) {
        // get all the attributes along with the namespace declns
        schema.setNamespaceContext(new NodeNamespaceContext(schemaEl));
        setNamespaceAttributes(schema, schemaEl);

        XmlSchemaCollection.SchemaKey schemaKey = new XmlSchemaCollection.SchemaKey(schema.logicalTargetNamespace, uri);
        if (!collection.containsSchema(schemaKey)) {
            collection.addSchema(schemaKey, schema);
        }

        schema.setElementFormDefault(this.getFormDefault(schemaEl,
                "elementFormDefault"));
        schema.setAttributeFormDefault(this.getFormDefault(schemaEl,
                "attributeFormDefault"));
        schema.setBlockDefault(this.getDerivation(schemaEl, "blockDefault"));
        schema.setFinalDefault(this.getDerivation(schemaEl, "finalDefault"));
        schema.setSourceURI(uri);

        //add the extesibility components
        processExtensibilityComponents(schema,schemaEl);

        /***********
         * for ( each childElement)
         *    if( simpleTypeElement)
         *      handleSimpleType
         *    else if( complexType)
         *      handleComplexType
         *    else if( element)
         *      handleElement
         *    else if( include)
         *      handleInclude
         *    else if( import)
         *      handleImport
         *    else if (group)
         *      handleGroup
         *    else if (attributeGroup)
         *      handleattributeGroup
         *    else if( attribute)
         *      handleattribute
         *    else if (redefine)
         *      handleRedefine
         *    else if(notation)
         *      handleNotation
         *      else if (annotation)
         *          handleAnnotation
         */

        Element el = XDOMUtil.getFirstChildElementNS(schemaEl, XmlSchema.SCHEMA_NS);
        if (el == null && XDOMUtil.getFirstChildElementNS(schemaEl, "http://www.w3.org/1999/XMLSchema") != null) {
            throw new XmlSchemaException("Schema defined using \"http://www.w3.org/1999/XMLSchema\" is not supported. " +
                    "Please update the schema to the \"" + XmlSchema.SCHEMA_NS + "\" namespace");
        }
        for (; el != null;
             el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            // String elPrefix = el.getPrefix() == null ? "" : el.getPrefix();
            //if(elPrefix.equals(schema.schema_ns_prefix)) {
            if (el.getLocalName().equals("simpleType")) {
                XmlSchemaType type = handleSimpleType(schema, el, schemaEl);
                schema.addType(type);
                schema.items.add(type);
                collection.resolveType(type.getQName(), type);
            } else if (el.getLocalName().equals("complexType")) {
                XmlSchemaType type = handleComplexType(schema, el, schemaEl);
                schema.addType(type);
                schema.items.add(type);
                collection.resolveType(type.getQName(), type);
            } else if (el.getLocalName().equals("element")) {
                XmlSchemaElement element = handleElement(schema, el, schemaEl, true);
                if (element.qualifiedName != null)
                    schema.elements.collection.put(element.qualifiedName, element);
                else if (element.refName != null)
                    schema.elements.collection.put(element.refName, element);
                schema.items.add(element);
            } else if (el.getLocalName().equals("include")) {
                XmlSchemaInclude include = handleInclude(schema,
                        el, schemaEl);
                schema.includes.add(include);
                schema.items.add(include);

            } else if (el.getLocalName().equals("import")) {
                XmlSchemaImport schemaImport = handleImport(schema,
                        el, schemaEl);
                schema.includes.add(schemaImport);
                schema.items.add(schemaImport);
            } else if (el.getLocalName().equals("group")) {
                XmlSchemaGroup group = handleGroup(schema, el, schemaEl);
                schema.groups.collection.put(group.name, group);
                schema.items.add(group);
            } else if (el.getLocalName().equals("attributeGroup")) {
                XmlSchemaAttributeGroup group = handleAttributeGroup(schema,
                        el, schemaEl);
                schema.attributeGroups.collection.put(group.name, group);
                schema.items.add(group);
            } else if (el.getLocalName().equals("attribute")) {
                XmlSchemaAttribute attr = handleAttribute(schema,
                        el, schemaEl);
                schema.attributes.collection.put(attr.qualifiedName, attr);
                schema.items.add(attr);
            } else if (el.getLocalName().equals("redefine")) {
                XmlSchemaRedefine redefine = handleRedefine(schema,
                        el, schemaEl);
                schema.includes.add(redefine);
            } else if (el.getLocalName().equals("notation")) {
                XmlSchemaNotation notation = handleNotation(el);
                schema.notations.collection.put(notation.name, notation);
                schema.items.add(notation);
            } else if (el.getLocalName().equals("annotation")) {
              XmlSchemaAnnotation annotation = handleAnnotation(el);
                schema.setAnnotation(annotation);
            }
        }
        return schema;
    }

    private XmlSchemaNotation handleNotation(
            Element notationEl
    ) {

        XmlSchemaNotation notation = new XmlSchemaNotation();

        if (notationEl.hasAttribute("id")) {
            notation.id = notationEl.getAttribute("id");
        }

        if (notationEl.hasAttribute("name")) {
            notation.name = notationEl.getAttribute("name");
        }

        if (notationEl.hasAttribute("public")) {
            notation.publicNotation = notationEl.getAttribute("public");
        }

        if (notationEl.hasAttribute("system")) {
            notation.system = notationEl.getAttribute("system");
        }

        Element annotationEl =
                XDOMUtil.getFirstChildElementNS(notationEl,
                        XmlSchema.SCHEMA_NS, "annotation");

        if (annotationEl != null) {
            XmlSchemaAnnotation annotation = handleAnnotation(annotationEl);
            notation.setAnnotation(annotation);
        }

        return notation;
    }

    private XmlSchemaRedefine handleRedefine(XmlSchema schema,
                                             Element redefineEl, Element schemaEl) {

        XmlSchemaRedefine redefine = new XmlSchemaRedefine();
        redefine.schemaLocation =
                redefineEl.getAttribute("schemaLocation");
        final TargetNamespaceValidator validator = newIncludeValidator(schema);
        redefine.schema =
                resolveXmlSchema(schema.logicalTargetNamespace, redefine.schemaLocation, validator);

        for (Element el = XDOMUtil.getFirstChildElementNS(redefineEl,
                XmlSchema.SCHEMA_NS)
                ; el != null;
                  el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("simpleType")) {
                XmlSchemaType type =
                        handleSimpleType(schema, el, schemaEl);

                redefine.schemaTypes.collection.put(type.getQName(),
                        type);
                redefine.items.add(type);
            } else if (el.getLocalName().equals("complexType")) {

                XmlSchemaType type = handleComplexType(schema, el,
                        schemaEl);

                redefine.schemaTypes.collection.put(type.getQName(),
                        type);
                redefine.items.add(type);
            } else if (el.getLocalName().equals("group")) {
                XmlSchemaGroup group = handleGroup(schema, el,
                        schemaEl);
                redefine.groups.collection.put(group.name, group);
                redefine.items.add(group);
            } else if (el.getLocalName().equals("attributeGroup")) {
                XmlSchemaAttributeGroup group =
                        handleAttributeGroup(schema, el, schemaEl);

                redefine.attributeGroups.collection.put(group.name, group);
                redefine.items.add(group);
            } else if (el.getLocalName().equals("annotation")) {
                XmlSchemaAnnotation annotation = handleAnnotation(el);
                redefine.setAnnotation(annotation);
            }
            //                  }
        }
        return redefine;
    }

    void setNamespaceAttributes(XmlSchema schema, Element schemaEl) {
        //no targetnamespace found !
        if (schemaEl.getAttributeNode("targetNamespace") != null) {
            String contain = schemaEl.getAttribute("targetNamespace");
            schema.setTargetNamespace(contain);
        } else {
            //do nothing here
        }
        if (validator != null) {
            validator.validate(schema);
        }
    }

    /**
     * Handles simple types
     * @param schema
     * @param simpleEl
     * @param schemaEl
     */
    XmlSchemaSimpleType handleSimpleType(XmlSchema schema,
                                         Element simpleEl, Element schemaEl) {
        XmlSchemaSimpleType simpleType = new XmlSchemaSimpleType(schema);
        if (simpleEl.hasAttribute("name")) {
            simpleType.name = simpleEl.getAttribute("name");
        }

        if (simpleEl.hasAttribute("final")) {
            String finalstr = simpleEl.getAttribute("final");

            if (finalstr.equalsIgnoreCase("all") |
                    finalstr.equalsIgnoreCase("#all"))

                simpleType.setFinal(new XmlSchemaDerivationMethod(Constants.BlockConstants.ALL));
            else
                simpleType.setFinal(new XmlSchemaDerivationMethod(finalstr));
        }

        Element simpleTypeAnnotationEl =
                XDOMUtil.getFirstChildElementNS(simpleEl,
                        XmlSchema.SCHEMA_NS, "annotation");

        if (simpleTypeAnnotationEl != null) {
            XmlSchemaAnnotation simpleTypeAnnotation =
                    handleAnnotation(simpleTypeAnnotationEl);

            simpleType.setAnnotation(simpleTypeAnnotation);
        }

        Element unionEl, listEl, restrictionEl;

        if ((restrictionEl =
                XDOMUtil.getFirstChildElementNS(simpleEl, XmlSchema.SCHEMA_NS, "restriction")) != null) {

            XmlSchemaSimpleTypeRestriction restriction =
                    new XmlSchemaSimpleTypeRestriction();

            Element restAnnotationEl =
                    XDOMUtil.getFirstChildElementNS(restrictionEl,
                            XmlSchema.SCHEMA_NS, "annotation");

            if (restAnnotationEl != null) {
                XmlSchemaAnnotation restAnnotation =
                        handleAnnotation(restAnnotationEl);
                restriction.setAnnotation(restAnnotation);
            }
            /** if (restriction has a base attribute )
             *    set the baseTypeName and look up the base type
             *  else if( restricion has a SimpleType Element as child)
             *    get that element and do a handleSimpleType;
             *  get the children of restriction other than annotation
             * and simpleTypes and construct facets from it;
             *
             *  set the restriction has the content of the simpleType
             *
             **/

            Element inlineSimpleType =
                    XDOMUtil.getFirstChildElementNS(restrictionEl,
                            XmlSchema.SCHEMA_NS, "simpleType");

            if (restrictionEl.hasAttribute("base")) {
              NamespaceContext ctx = new NodeNamespaceContext(restrictionEl);
              restriction.baseTypeName = getRefQName(restrictionEl.getAttribute("base"), ctx);
            } else if (inlineSimpleType != null) {

                restriction.baseType = handleSimpleType(schema, inlineSimpleType, schemaEl);
            }
            for (Element el = XDOMUtil.getFirstChildElementNS(restrictionEl, XmlSchema.SCHEMA_NS)
                    ; el != null;
                      el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

                if (!el.getLocalName().equals("annotation")
                        &&
                        !el.getLocalName().equals("simpleType")) {

                    XmlSchemaFacet facet = XmlSchemaFacet.construct(el);
                    Element annotation =
                            XDOMUtil.getFirstChildElementNS(el, XmlSchema.SCHEMA_NS,
                                    "annotation");

                    if (annotation != null) {
                        XmlSchemaAnnotation facetAnnotation =
                                handleAnnotation(annotation);
                        facet.setAnnotation(facetAnnotation);
                    }
                    restriction.facets.add(facet);
                }

            }
            simpleType.content = restriction;

        } else if ((listEl = XDOMUtil.getFirstChildElementNS(simpleEl,
                XmlSchema.SCHEMA_NS, "list")) != null) {

            XmlSchemaSimpleTypeList list = new XmlSchemaSimpleTypeList();

            /******
             * if( list has an itemType attribute )
             *    set the baseTypeName and look up the base type
             * else if( list has a SimpleTypeElement as child)
             *    get that element and do a handleSimpleType
             *
             * set the list has the content of the simpleType
             */
            Element inlineListType, listAnnotationEl;
            if (listEl.hasAttribute("itemType")) {
                String name = listEl.getAttribute("itemType");
                list.itemTypeName = getRefQName(name, listEl);
            } else if ((inlineListType =
                    XDOMUtil.getFirstChildElementNS(listEl, XmlSchema.SCHEMA_NS,
                            "simpleType")) != null) {

                list.itemType = handleSimpleType(schema, inlineListType, schemaEl);
            }

            if ((listAnnotationEl =
                    XDOMUtil.getFirstChildElementNS(listEl, XmlSchema.SCHEMA_NS,
                            "annotation")) != null) {

                XmlSchemaAnnotation listAnnotation =
                        handleAnnotation(listAnnotationEl);

                list.setAnnotation(listAnnotation);
            }
            simpleType.content = list;

        } else if ((unionEl =
                XDOMUtil.getFirstChildElementNS(simpleEl, XmlSchema.SCHEMA_NS,
                        "union")) != null) {

            XmlSchemaSimpleTypeUnion union =
                    new XmlSchemaSimpleTypeUnion();

            /******
             * if( union has a memberTypes attribute )
             *    add the memberTypeSources string
             *    for (each memberType in the list )
             *      lookup(memberType)
             *  for( all SimpleType child Elements)
             *    add the simpleTypeName (if any) to the memberType Sources
             *    do a handleSimpleType with the simpleTypeElement
             */
            if (unionEl.hasAttribute("memberTypes")) {
                String memberTypes = unionEl.getAttribute("memberTypes");
                union.memberTypesSource = memberTypes;
                Vector v = new Vector();
                StringTokenizer tokenizer = new StringTokenizer(memberTypes, " ");
                while (tokenizer.hasMoreTokens()) {
                    String member = tokenizer.nextToken();
                    v.add(getRefQName(member, unionEl));
                }
                union.memberTypesQNames = new QName[v.size()];
                v.copyInto(union.memberTypesQNames);
            }

            Element inlineUnionType =
                    XDOMUtil.getFirstChildElementNS(unionEl, XmlSchema.SCHEMA_NS,
                            "simpleType");
            while (inlineUnionType != null) {

                XmlSchemaSimpleType unionSimpleType =
                        handleSimpleType(schema, inlineUnionType,
                                schemaEl);

                union.baseTypes.add(unionSimpleType);

                if(unionSimpleType.name != null) {
                    union.memberTypesSource += " " + unionSimpleType.name;
                }

                inlineUnionType =
                        XDOMUtil.getNextSiblingElementNS(inlineUnionType,
                                XmlSchema.SCHEMA_NS,
                                "simpleType");
            }

            //NodeList annotations = unionEl.getElementsByTagNameNS(
            //XmlSchema.SCHEMA_NS, "annotation");
            Element unionAnnotationEl =
                    XDOMUtil.getFirstChildElementNS(unionEl, XmlSchema.SCHEMA_NS,
                            "annotation");

            if (unionAnnotationEl != null) {
                XmlSchemaAnnotation unionAnnotation =
                        handleAnnotation(unionAnnotationEl);

                union.setAnnotation(unionAnnotation);
            }
            simpleType.content = union;
        }

        //process extra attributes and elements
        processExtensibilityComponents(simpleType,simpleEl);

        return simpleType;
    }

    private QName getRefQName(String pName, Node pNode) {
        return getRefQName(pName, new NodeNamespaceContext(pNode));
    }

    private QName getRefQName(String pName, NamespaceContext pContext) {
      final int offset = pName.indexOf(':');
      String uri;
      final String localName;
      final String prefix;
      if (offset == -1) {
        uri = pContext.getNamespaceURI(Constants.DEFAULT_NS_PREFIX);
        if (Constants.NULL_NS_URI.equals(uri)) {
          return new QName(schema.logicalTargetNamespace, pName);
        }
        localName = pName;
        prefix = Constants.DEFAULT_NS_PREFIX;
      } else {
        prefix = pName.substring(0, offset);
        uri = pContext.getNamespaceURI(prefix);
            if (uri == null  ||  Constants.NULL_NS_URI.equals(uri)) {
                if(schema.parent != null && schema.parent.getNamespaceContext() != null) {
                    uri = schema.parent.getNamespaceContext().getNamespaceURI(prefix);
                }
            }

        if (uri == null  ||  Constants.NULL_NS_URI.equals(uri)) {
                throw new IllegalStateException("The prefix " + prefix + " is not bound.");
        }
        localName = pName.substring(offset+1);
      }
      return new QName(uri, localName, prefix);
    }

    /**
     * Handle complex types
     * @param schema
     * @param complexEl
     * @param schemaEl
     */
    XmlSchemaComplexType handleComplexType(XmlSchema schema,
                                           Element complexEl, Element schemaEl) {

        /******
         * set the complexTypeName if any
         * for( eachChildNode)
         * if ( simpleContent)
         *    if( restrcition)
         *      handle_simple_content_restriction
         *    else if( extension)
         *      handle_simple_content_extension
         *    break; // it has to be the only child
         * else if( complexContent)
         *    if( restriction)
         *      handle_complex_content_restriction
         *    else if( extension)
         *      handle_complex_content_extension
         *    break; // it has to be the only child
         * else if( group)
         *    if( group has ref)
         *      store the group name
         *    else
         *      handleGroup
         * else if( sequence )
         *    handleSequence
         * else if( all )
         *    handleAll
         * else if(choice)
         *    handleChoice
         * else if(attribute)
         *    handleAttribute
         * else if(attributeGroup)
         *    handleAttributeGroup
         *  else if(anyAttribute)
         *    handleAnyAttribute
         */

        XmlSchemaComplexType ct = new XmlSchemaComplexType(schema);

        if (complexEl.hasAttribute("name")) {

            //String namespace = (schema.targetNamespace==null)?
            //                  "":schema.targetNamespace;

            ct.name = complexEl.getAttribute("name");
        }
        for (Element el = XDOMUtil.getFirstChildElementNS(complexEl,
                XmlSchema.SCHEMA_NS)
                ; el != null;
                  el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            //String elPrefix = el.getPrefix() == null ? "" :
            //el.getPrefix();
            //if(elPrefix.equals(schema.schema_ns_prefix)) {
            if (el.getLocalName().equals("sequence")) {
                ct.particle = handleSequence(schema,
                        el, schemaEl);
            } else if (el.getLocalName().equals("choice")) {
                ct.particle = handleChoice(schema,
                        el, schemaEl);
            } else if (el.getLocalName().equals("all")) {
                ct.particle = handleAll(schema, el, schemaEl);
            } else if (el.getLocalName().equals("attribute")) {
                ct.attributes.add(handleAttribute(schema,
                        el, schemaEl));
            } else if (el.getLocalName().equals("attributeGroup")) {
                ct.attributes.add(handleAttributeGroupRef(el));
            } else if (el.getLocalName().equals("group")) {
                XmlSchemaGroupRef group =
                        handleGroupRef(schema, el, schemaEl);
                ct.particle = (group.particle == null) ?
                        (XmlSchemaParticle) group : group.particle;
            } else if (el.getLocalName().equals("simpleContent")) {
                ct.contentModel = handleSimpleContent(schema, el, schemaEl);
            } else if (el.getLocalName().equals("complexContent")) {
                ct.contentModel = handleComplexContent(schema, el, schemaEl);
            } else if (el.getLocalName().equals("annotation")) {
                ct.setAnnotation(handleAnnotation(el));
            } else if (el.getLocalName().equals("anyAttribute")) {
                ct.setAnyAttribute(handleAnyAttribute(schema,el,schemaEl));
            }
            //}
        }
        if (complexEl.hasAttribute("block")) {
            String blockStr = complexEl.getAttribute("block");
            if (blockStr.equalsIgnoreCase("all") |
                    blockStr.equalsIgnoreCase("#all")) {

                ct.setBlock(new XmlSchemaDerivationMethod(Constants.BlockConstants.ALL));
            } else
                ct.setBlock(new XmlSchemaDerivationMethod(blockStr));
            //ct.setBlock(new XmlSchemaDerivationMethod(block));
        }
        if (complexEl.hasAttribute("final")) {
            String finalstr = complexEl.getAttribute("final");
            if (finalstr.equalsIgnoreCase("all") |
                    finalstr.equalsIgnoreCase("#all")) {

                ct.setFinal(new XmlSchemaDerivationMethod(Constants.BlockConstants.ALL));
            } else
                ct.setFinal(new XmlSchemaDerivationMethod(finalstr));
        }
        if (complexEl.hasAttribute("abstract")) {
            String abs = complexEl.getAttribute("abstract");
            if (abs.equalsIgnoreCase("true"))
                ct.setAbstract(true);
            else
                ct.setAbstract(false);
        }
        if (complexEl.hasAttribute("mixed")) {
            String mixed = complexEl.getAttribute("mixed");
            if (mixed.equalsIgnoreCase("true"))
                ct.setMixed(true);
            else
                ct.setMixed(false);
        }

        //process extra attributes and elements
        processExtensibilityComponents(ct,complexEl);

        return ct;
    }

    private XmlSchemaSimpleContent
            handleSimpleContent(XmlSchema schema, Element simpleEl,
                                Element schemaEl) {

        XmlSchemaSimpleContent simpleContent =
                new XmlSchemaSimpleContent();

        for (Element el = XDOMUtil.getFirstChildElementNS(simpleEl,
                XmlSchema.SCHEMA_NS)
                ; el != null;
                  el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("restriction")) {
                simpleContent.content = handleSimpleContentRestriction(schema, el, schemaEl);
            } else if (el.getLocalName().equals("extension")) {
                simpleContent.content = handleSimpleContentExtension(schema, el, schemaEl);
            } else if (el.getLocalName().equals("annotation")) {
                simpleContent.setAnnotation(handleAnnotation(el));
            }
        }
        return simpleContent;
    }

    private XmlSchemaComplexContent handleComplexContent(XmlSchema schema,
                                                         Element complexEl,
                                                         Element schemaEl) {

        XmlSchemaComplexContent complexContent =
                new XmlSchemaComplexContent();

        for (Element el =
                XDOMUtil.getFirstChildElementNS(complexEl, XmlSchema.SCHEMA_NS);
             el != null;
             el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("restriction")) {
                complexContent.content = handleComplexContentRestriction(schema, el,
                                schemaEl);
            } else if (el.getLocalName().equals("extension")) {
                complexContent.content = handleComplexContentExtension(schema, el,
                                schemaEl);
            } else if (el.getLocalName().equals("annotation")) {
                complexContent.setAnnotation(handleAnnotation(el));
            }
        }
        return complexContent;
    }

    private XmlSchemaSimpleContentRestriction
            handleSimpleContentRestriction(XmlSchema schema,
                                           Element restrictionEl, Element schemaEl) {

        XmlSchemaSimpleContentRestriction restriction =
                new XmlSchemaSimpleContentRestriction();

        if (restrictionEl.hasAttribute("base")) {
            String name = restrictionEl.getAttribute("base");
            restriction.baseTypeName = getRefQName(name, restrictionEl);
        }

        if (restrictionEl.hasAttribute("id"))
            restriction.id = restrictionEl.getAttribute("id");

        // check back simpleContent tag children to add attributes and simpleType if any occur
        for (
                Element el = XDOMUtil.getFirstChildElementNS(restrictionEl,
                        XmlSchema.SCHEMA_NS)
                        ; el != null;
                          el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("attribute")) {
                XmlSchemaAttribute attr =
                        handleAttribute(schema, el, schemaEl);
                restriction.attributes.add(attr);
            } else if (el.getLocalName().equals("attributeGroup")) {
                XmlSchemaAttributeGroupRef attrGroup =
                        handleAttributeGroupRef(el);
                restriction.attributes.add(attrGroup);
            } else if (el.getLocalName().equals("simpleType")) {
                restriction.baseType = handleSimpleType(schema, el, schemaEl);
            } else if (el.getLocalName().equals("anyAttribute")) {
                restriction.anyAttribute =
                        handleAnyAttribute(schema, el, schemaEl);
            } else if (el.getLocalName().equals("annotation")) {
                restriction.setAnnotation(handleAnnotation(el));
            } else {
                XmlSchemaFacet facet = XmlSchemaFacet.construct(el);
                NodeList annotations =
                        el.getElementsByTagNameNS(XmlSchema.SCHEMA_NS, "annotation");

                if (annotations.getLength() > 0) {
                    XmlSchemaAnnotation facetAnnotation =
                            handleAnnotation(el);
                    facet.setAnnotation(facetAnnotation);
                }
                restriction.facets.add(facet);
            }
        }
        return restriction;
    }

    private XmlSchemaSimpleContentExtension
            handleSimpleContentExtension(XmlSchema schema, Element extEl,
                                         Element schemaEl) {

        XmlSchemaSimpleContentExtension ext =
                new XmlSchemaSimpleContentExtension();

        if (extEl.hasAttribute("base")) {
            String name = extEl.getAttribute("base");
            ext.baseTypeName = getRefQName(name, extEl);
        }

        for (
                Element el = XDOMUtil.getFirstChildElementNS(extEl, XmlSchema.SCHEMA_NS)
                        ; el != null;
                          el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("attribute")) {
                XmlSchemaAttribute attr =
                        handleAttribute(schema, el, schemaEl);
                ext.attributes.add(attr);
            } else if (el.getLocalName().equals("attributeGroup")) {
                XmlSchemaAttributeGroupRef attrGroup =
                        handleAttributeGroupRef(el);
                ext.attributes.add(attrGroup);
            } else if (el.getLocalName().equals("anyAttribute")) {
                ext.anyAttribute =
                        handleAnyAttribute(schema, el, schemaEl);
            } else if (el.getLocalName().equals("annotation")) {
                XmlSchemaAnnotation ann = handleAnnotation(el);
                ext.setAnnotation(ann);
            }
        }
        return ext;
    }

    private XmlSchemaComplexContentRestriction
            handleComplexContentRestriction(XmlSchema schema,
                                            Element restrictionEl, Element schemaEl) {

        XmlSchemaComplexContentRestriction restriction =
                new XmlSchemaComplexContentRestriction();

        if (restrictionEl.hasAttribute("base")) {
            String name = restrictionEl.getAttribute("base");
            restriction.baseTypeName = getRefQName(name, restrictionEl);
        }
        for (Element el = XDOMUtil.getFirstChildElementNS(restrictionEl,
                XmlSchema.SCHEMA_NS)
                ; el != null;
                  el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("sequence")) {
                restriction.particle = handleSequence(schema, el, schemaEl);
            } else if (el.getLocalName().equals("choice")) {
                restriction.particle = handleChoice(schema, el, schemaEl);
            } else if (el.getLocalName().equals("all")) {
                restriction.particle = handleAll(schema, el, schemaEl);
            } else if (el.getLocalName().equals("attribute")) {
                restriction.attributes.add(handleAttribute(schema, el, schemaEl));
            } else if (el.getLocalName().equals("attributeGroup")) {
                restriction.attributes.add(handleAttributeGroupRef(el));
            } else if (el.getLocalName().equals("group")) {
                restriction.particle = handleGroupRef(schema, el, schemaEl);
            } else if (el.getLocalName().equals("anyAttribute")) {
                restriction.anyAttribute =
                        handleAnyAttribute(schema, el, schemaEl);
            } else if (el.getLocalName().equals("annotation")) {
                restriction.setAnnotation(handleAnnotation(el));
            }
        }
        return restriction;
    }

    private XmlSchemaComplexContentExtension
            handleComplexContentExtension(XmlSchema schema,
                                          Element extEl, Element schemaEl) {

        XmlSchemaComplexContentExtension ext =
                new XmlSchemaComplexContentExtension();

        if (extEl.hasAttribute("base")) {
            String name = extEl.getAttribute("base");
            ext.baseTypeName = getRefQName(name, extEl);
        }

        for (Element el = XDOMUtil.getFirstChildElementNS(extEl, XmlSchema.SCHEMA_NS)
                ; el != null;
                  el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("sequence")) {
                ext.particle = handleSequence(schema, el, schemaEl);
            } else if (el.getLocalName().equals("choice")) {
                ext.particle = handleChoice(schema, el, schemaEl);
            } else if (el.getLocalName().equals("all")) {
                ext.particle = handleAll(schema, el, schemaEl);
            } else if (el.getLocalName().equals("attribute")) {
                ext.attributes.add(handleAttribute(schema, el, schemaEl));
            } else if (el.getLocalName().equals("attributeGroup")) {
                ext.attributes.add(handleAttributeGroupRef(el));
            } else if (el.getLocalName().equals("group")) {
                ext.particle = handleGroupRef(schema, el, schemaEl);
            } else if (el.getLocalName().equals("anyAttribute")) {
                ext.anyAttribute =
                        handleAnyAttribute(schema, el, schemaEl);
            } else if (el.getLocalName().equals("annotation")) {
                ext.setAnnotation(handleAnnotation(el));
            }
        }
        return ext;
    }

    private XmlSchemaAttributeGroupRef
            handleAttributeGroupRef(Element attrGroupEl
    ) {

        XmlSchemaAttributeGroupRef attrGroup =
                new XmlSchemaAttributeGroupRef();

        if (attrGroupEl.hasAttribute("ref")) {
            String ref = attrGroupEl.getAttribute("ref");
            attrGroup.refName = getRefQName(ref, attrGroupEl);
        }

        if (attrGroupEl.hasAttribute("id"))
            attrGroup.id = attrGroupEl.getAttribute("id");

        Element annotationEl =
                XDOMUtil.getFirstChildElementNS(attrGroupEl,
                        XmlSchema.SCHEMA_NS, "annotation");

        if (annotationEl != null) {
            XmlSchemaAnnotation annotation = handleAnnotation(annotationEl);
            attrGroup.setAnnotation(annotation);
        }
        return attrGroup;
    }

    private XmlSchemaSequence handleSequence(XmlSchema schema,
                                             Element sequenceEl,
                                             Element schemaEl) {

        XmlSchemaSequence sequence = new XmlSchemaSequence();
        for (Element el = XDOMUtil.getFirstChildElementNS(sequenceEl, XmlSchema.SCHEMA_NS)
                ; el != null;
                  el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("sequence")) {
                XmlSchemaSequence seq = handleSequence(schema, el,
                        schemaEl);
                sequence.items.add(seq);
            } else if (el.getLocalName().equals("element")) {
                XmlSchemaElement element = handleElement(schema, el,
                        schemaEl, false);
                sequence.items.add(element);
            } else if (el.getLocalName().equals("group")) {
                XmlSchemaGroupRef group = handleGroupRef(schema, el,
                        schemaEl);
                sequence.items.add(group);
            } else if (el.getLocalName().equals("choice")) {
                XmlSchemaChoice choice = handleChoice(schema, el,
                        schemaEl);
                sequence.items.add(choice);
            } else if (el.getLocalName().equals("any")) {
                XmlSchemaAny any = handleAny(schema, el, schemaEl);
                sequence.items.add(any);
            } else if (el.getLocalName().equals("annotation")) {
                XmlSchemaAnnotation annotation = handleAnnotation(el);
                sequence.setAnnotation(annotation);
            }
        }
        return sequence;
    }

    /** @noinspection UnusedParameters*/
    private XmlSchemaAny handleAny(XmlSchema schema,
                                   Element anyEl,
                                   Element schemaEl) {

        XmlSchemaAny any = new XmlSchemaAny();

        if (anyEl.hasAttribute("namespace"))
            any.namespace = anyEl.getAttribute("namespace");

        if (anyEl.hasAttribute("processContents")) {
            String processContent = getEnumString(anyEl,
                    "processContents");

            any.processContent =
                    new XmlSchemaContentProcessing(processContent);
        }

        Element annotationEl = XDOMUtil.getFirstChildElementNS(anyEl,
                XmlSchema.SCHEMA_NS, "annotation");

        if (annotationEl != null) {
            XmlSchemaAnnotation annotation =
                    handleAnnotation(annotationEl);
            any.setAnnotation(annotation);
        }
        any.minOccurs = getMinOccurs(anyEl);
        any.maxOccurs = getMaxOccurs(anyEl);

        return any;
    }

    private XmlSchemaChoice handleChoice(XmlSchema schema, Element choiceEl,
                                         Element schemaEl) {
        XmlSchemaChoice choice = new XmlSchemaChoice();

        if (choiceEl.hasAttribute("id"))
            choice.id = choiceEl.getAttribute("id");

        choice.minOccurs = getMinOccurs(choiceEl);
        choice.maxOccurs = getMaxOccurs(choiceEl);

        for (Element el = XDOMUtil.getFirstChildElementNS(choiceEl,
                XmlSchema.SCHEMA_NS)
                ; el != null;
                  el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("sequence")) {
                XmlSchemaSequence seq =
                        handleSequence(schema, el, schemaEl);
                choice.items.add(seq);
            } else if (el.getLocalName().equals("element")) {
                XmlSchemaElement element =
                        handleElement(schema, el, schemaEl, false);
                choice.items.add(element);
            } else if (el.getLocalName().equals("group")) {
                XmlSchemaGroupRef group =
                        handleGroupRef(schema, el, schemaEl);
                choice.items.add(group);
            } else if (el.getLocalName().equals("choice")) {
                XmlSchemaChoice choiceItem =
                        handleChoice(schema, el, schemaEl);
                choice.items.add(choiceItem);
            } else if (el.getLocalName().equals("any")) {
                XmlSchemaAny any = handleAny(schema, el, schemaEl);
                choice.items.add(any);
            } else if (el.getLocalName().equals("annotation")) {
                XmlSchemaAnnotation annotation = handleAnnotation(el);
                choice.setAnnotation(annotation);
            }
        }
        return choice;
    }

    private XmlSchemaAll handleAll(XmlSchema schema, Element allEl,
                                   Element schemaEl) {

        XmlSchemaAll all = new XmlSchemaAll();

        for (Element el = XDOMUtil.getFirstChildElementNS(allEl, XmlSchema.SCHEMA_NS);
             el != null; el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("element")) {
                XmlSchemaElement element = handleElement(schema, el, schemaEl, false);
                all.items.add(element);
            } else if (el.getLocalName().equals("annotation")) {
                XmlSchemaAnnotation annotation = handleAnnotation(el);
                all.setAnnotation(annotation);
            }
        }
        return all;
    }

    private XmlSchemaGroup handleGroup(XmlSchema schema, Element groupEl,
                                       Element schemaEl) {

        XmlSchemaGroup group = new XmlSchemaGroup();
        group.name = groupEl.getAttribute("name");

        for (Element el = XDOMUtil.getFirstChildElementNS(groupEl,
                XmlSchema.SCHEMA_NS);
             el != null;
             el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("all")) {
                group.particle = handleAll(schema, el, schemaEl);
            } else if (el.getLocalName().equals("sequence")) {
                group.particle = handleSequence(schema, el, schemaEl);
            } else if (el.getLocalName().equals("choice")) {
                group.particle = handleChoice(schema, el, schemaEl);
            } else if (el.getLocalName().equals("annotation")) {
                XmlSchemaAnnotation groupAnnotation =
                        handleAnnotation(el);
                group.setAnnotation(groupAnnotation);
            }
        }
        return group;
    }

    private XmlSchemaAttributeGroup handleAttributeGroup(XmlSchema schema,
                                                         Element groupEl,
                                                         Element schemaEl) {
        XmlSchemaAttributeGroup attrGroup =
                new XmlSchemaAttributeGroup();

        if (groupEl.hasAttribute("name"))
            attrGroup.name = groupEl.getAttribute("name");
        if (groupEl.hasAttribute("id"))
            attrGroup.id = groupEl.getAttribute("id");

        for (Element el = XDOMUtil.getFirstChildElementNS(groupEl,
                XmlSchema.SCHEMA_NS);
             el != null;
             el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

            if (el.getLocalName().equals("attribute")) {
                XmlSchemaAttribute attr =
                        handleAttribute(schema, el, schemaEl);
                attrGroup.attributes.add(attr);
            } else if (el.getLocalName().equals("attributeGroup")) {
                XmlSchemaAttributeGroupRef attrGroupRef =
                        handleAttributeGroupRef(el);
                attrGroup.attributes.add(attrGroupRef);
            } else if (el.getLocalName().equals("anyAttribute")) {
                attrGroup.anyAttribute = handleAnyAttribute(schema,
                        el, schemaEl);
            } else if (el.getLocalName().equals("annotation")) {
                XmlSchemaAnnotation ann = handleAnnotation(el);
                attrGroup.setAnnotation(ann);
            }
        }
        return attrGroup;
    }

    /** @noinspection UnusedParameters*/
    private XmlSchemaAnyAttribute handleAnyAttribute(XmlSchema schema,
                                                     Element anyAttrEl,
                                                     Element schemaEl) {

        XmlSchemaAnyAttribute anyAttr = new XmlSchemaAnyAttribute();

        if (anyAttrEl.hasAttribute("namespace"))
            anyAttr.namespace = anyAttrEl.getAttribute("namespace");

        if (anyAttrEl.hasAttribute("processContents")) {

            String contentProcessing = getEnumString(anyAttrEl,
                    "processContents");

            anyAttr.processContent = new XmlSchemaContentProcessing(contentProcessing);
        }
        if (anyAttrEl.hasAttribute("id"))
            anyAttr.id = anyAttrEl.getAttribute("id");

        Element annotationEl =
                XDOMUtil.getFirstChildElementNS(anyAttrEl,
                        XmlSchema.SCHEMA_NS, "annotation");

        if (annotationEl != null) {
            XmlSchemaAnnotation annotation =
                    handleAnnotation(annotationEl);

            anyAttr.setAnnotation(annotation);
        }
        return anyAttr;
    }

    private XmlSchemaGroupRef handleGroupRef(XmlSchema schema,
                                             Element groupEl, Element schemaEl) {

        XmlSchemaGroupRef group = new XmlSchemaGroupRef();

        Element annotationEl = XDOMUtil.getFirstChildElementNS(groupEl,
                XmlSchema.SCHEMA_NS,
                "annotation");

        if (annotationEl != null) {
            XmlSchemaAnnotation annotation =
                    handleAnnotation(annotationEl);

            group.setAnnotation(annotation);
        }

        if (groupEl.hasAttribute("ref")) {
            String ref = groupEl.getAttribute("ref");
            group.refName = getRefQName(ref, groupEl);
            return group;
        }
        for (Element el = XDOMUtil.getFirstChildElementNS(groupEl,
                XmlSchema.SCHEMA_NS)
                ; el != null;
                  el = XDOMUtil.getNextSiblingElement(el)) {

            if (el.getLocalName().equals("sequence")) {
                group.particle = handleSequence(schema, el, schemaEl);
            } else if (el.getLocalName().equals("all")) {
                group.particle = handleAll(schema, el, schemaEl);
            } else if (el.getLocalName().equals("choice")) {
                group.particle = handleChoice(schema, el,
                        schemaEl);
            }
        }
        return group;
    }

    private QName newLocalQName(String pLocalName) {
        String uri = schema.logicalTargetNamespace;
        if (uri == null) {
            uri = Constants.NULL_NS_URI;
        }
        return new QName(uri, pLocalName);
    }

    private XmlSchemaAttribute handleAttribute(XmlSchema schema,
                                               Element attrEl, Element schemaEl) {
        //todo: need to implement different rule of attribute such as
        //restriction between ref and name.  This can be implemented
        //in the compile function
        XmlSchemaAttribute attr = new XmlSchemaAttribute();

        if (attrEl.hasAttribute("name")) {
            String name = attrEl.getAttribute("name");
            //String namespace = (schema.targetNamespace==null)?
            //                  "" :schema.targetNamespace;

            attr.name = name;
        }
       
        boolean isQualified = schema.getAttributeFormDefault().getValue().equals(XmlSchemaForm.QUALIFIED);
        if (attr.name != null) {
            final String name = attr.name;
            attr.qualifiedName = (isQualified) ? newLocalQName(name) : new QName(name);
        }

        if (attrEl.hasAttribute("type")) {
            String name = attrEl.getAttribute("type");
            attr.schemaTypeName = getRefQName(name, attrEl);
        }

        if (attrEl.hasAttribute("default"))
            attr.defaultValue = attrEl.getAttribute("default");

        if (attrEl.hasAttribute("fixed"))
            attr.fixedValue = attrEl.getAttribute("fixed");

        if (attrEl.hasAttribute("form")) {
            String formValue = getEnumString(attrEl, "form");
            attr.form = new XmlSchemaForm(formValue);
        }
        if (attrEl.hasAttribute("id"))
            attr.id = attrEl.getAttribute("id");


        if (attrEl.hasAttribute("use")) {
            String useType = getEnumString(attrEl, "use");
            attr.use = new XmlSchemaUse(useType);
        }
        if (attrEl.hasAttribute("ref")) {
            String name = attrEl.getAttribute("ref");
            attr.refName = getRefQName(name, attrEl);
            attr.name = name;
        }

        Element simpleTypeEl =
                XDOMUtil.getFirstChildElementNS(attrEl,
                        XmlSchema.SCHEMA_NS, "simpleType");

        if (simpleTypeEl != null) {
            attr.schemaType = handleSimpleType(schema, simpleTypeEl,
                    schemaEl);
        }

        Element annotationEl =
                XDOMUtil.getFirstChildElementNS(attrEl,
                        XmlSchema.SCHEMA_NS, "annotation");

        if (annotationEl != null) {
            XmlSchemaAnnotation annotation =
                    handleAnnotation(annotationEl);

            attr.setAnnotation(annotation);
        }

        NamedNodeMap attrNodes = attrEl.getAttributes();
        Vector attrs = new Vector();
        NodeNamespaceContext ctx = null;
        for (int i = 0; i < attrNodes.getLength(); i++) {
            Attr att = (Attr) attrNodes.item(i);
            String attName = att.getName();
            if (!attName.equals("name") &&
                    !attName.equals("type") &&
                    !attName.equals("default") &&
                    !attName.equals("fixed") &&
                    !attName.equals("form") &&
                    !attName.equals("id") &&
                    !attName.equals("use") &&
                    !attName.equals("ref")) {


                attrs.add(att);
                String value = att.getValue();

                if (value.indexOf(":") > -1) {
                    // there is a possiblily of some namespace mapping
                    String prefix = value.substring(0, value.indexOf(":"));
                    if (ctx == null) {
                        ctx = new NodeNamespaceContext(attrEl);
                    }
                    String namespace = ctx.getNamespaceURI(prefix);
                    if (!Constants.NULL_NS_URI.equals(namespace)) {
                        Attr nsAttr = attrEl.getOwnerDocument().createAttribute("xmlns:" + prefix);
                        nsAttr.setValue(namespace);
                        attrs.add(nsAttr);
                    }
                }
            }
        }

        if (attrs.size() > 0)
            attr.setUnhandledAttributes((Attr[]) attrs.toArray(new Attr[0]));
        return attr;
    }

    /*
     * handle_simple_content_restriction
     *
     * if( restriction has base attribute )
     *    set the baseType
     * else if( restriciton has an inline simpleType )
     *    handleSimpleType
     * add facets if any to the restriction
     */

    /*
     * handle_simple_content_extension
     *
     * extension should have a base name and cannot have any inline defn
     * for( each childNode  )
     *    if( attribute)
     *      handleAttribute
     *    else if( attributeGroup)
     *      handleAttributeGroup
     *    else if( anyAttribute)
     *      handleAnyAttribute
     */

    /*
     * ********
     * handle_complex_content_restriction
     */
    /**
     * handle elements
     * @param schema
     * @param el
     * @param schemaEl
     * @param isGlobal
     */
    XmlSchemaElement handleElement(XmlSchema schema,
                                   Element el,
                                   Element schemaEl,
                                   boolean isGlobal) {

        XmlSchemaElement element = new XmlSchemaElement();

        if (el.getAttributeNode("name") != null)
            element.name = el.getAttribute("name");

        //                String namespace = (schema.targetNamespace==null)?
        //                                      "" : schema.targetNamespace;

        boolean isQualified = schema.getElementFormDefault().getValue().equals(XmlSchemaForm.QUALIFIED);
        if (el.hasAttribute("form")) {
            String formDef = el.getAttribute("form");
            element.form = new XmlSchemaForm(formDef);
            isQualified = formDef.equals(XmlSchemaForm.QUALIFIED);
        }

        if (element.name != null) {
            final String name = element.name;
            element.qualifiedName = (isQualified || isGlobal) ? newLocalQName(name) : new QName(Constants.NULL_NS_URI, name);
        }

        Element annotationEl =
                XDOMUtil.getFirstChildElementNS(el,
                        XmlSchema.SCHEMA_NS,
                        "annotation");

        if (annotationEl != null) {
            XmlSchemaAnnotation annotation =
                    handleAnnotation(annotationEl);

            element.setAnnotation(annotation);
        }
        if (el.getAttributeNode("type") != null) {
            String typeName = el.getAttribute("type");
            QName typeQName = element.schemaTypeName = getRefQName(typeName, el);

            XmlSchemaType type = collection.getTypeByQName(typeQName);
            if (type == null) {
                // Could be a forward reference...
                collection.addUnresolvedType(typeQName, element);
            }
            element.schemaType = type;
        } else if (el.getAttributeNode("ref") != null) {
            String refName = el.getAttribute("ref");
            element.setRefName(getRefQName(refName, el));
            element.name = refName;
        }

        Element simpleTypeEl, complexTypeEl, keyEl, keyrefEl, uniqueEl;

        if ((simpleTypeEl = XDOMUtil.getFirstChildElementNS(el,
                XmlSchema.SCHEMA_NS, "simpleType")) != null) {

            XmlSchemaSimpleType simpleType =
                    handleSimpleType(schema, simpleTypeEl, schemaEl);
            element.schemaType = simpleType;
            element.schemaTypeName = simpleType.getQName();
        } else if ((complexTypeEl =
                XDOMUtil.getFirstChildElementNS(el, XmlSchema.SCHEMA_NS,
                        "complexType")) != null) {

            element.schemaType = handleComplexType(schema, complexTypeEl, schemaEl);
        }

        if ((keyEl =
                XDOMUtil.getFirstChildElementNS(el, XmlSchema.SCHEMA_NS, "key")) != null) {

            element.constraints.add(handleConstraint(keyEl, "Key"));
        }

        if ((keyrefEl = XDOMUtil.getFirstChildElementNS(el, XmlSchema.SCHEMA_NS, "keyref")) != null) {

            XmlSchemaKeyref keyRef =
                    (XmlSchemaKeyref) handleConstraint(keyrefEl,
                            "Keyref");

            if (el.hasAttribute("refer")) {
                String name = el.getAttribute("refer");
                keyRef.refer = getRefQName(name, el);
            }

            element.constraints.add(keyRef);

        }

        if ((uniqueEl =
                XDOMUtil.getFirstChildElementNS(el,
                        XmlSchema.SCHEMA_NS, "unique")) != null) {

            element.constraints.add(handleConstraint(uniqueEl, "Unique"));
        }

        if (el.hasAttribute("abstract")) {
            element.isAbstract =
                    Boolean.valueOf(el.getAttribute("abstract")).booleanValue();
        }

        if (el.hasAttribute("block"))
            element.block = getDerivation(el, "block");

        if (el.hasAttribute("default"))
            element.defaultValue = el.getAttribute("default");

        if (el.hasAttribute("final"))
            element.finalDerivation = getDerivation(el, "final");

        if (el.hasAttribute("fixed"))
            element.fixedValue = el.getAttribute("fixed");

        if (el.hasAttribute("id"))
            element.id = el.getAttribute("id");

        if (el.hasAttribute("nillable"))
            element.isNillable =
                    Boolean.valueOf(el.getAttribute("nillable")).booleanValue();

        if (el.hasAttribute("substitutionGroup")) {
            String substitutionGroup = el.getAttribute("substitutionGroup");
            element.setSubstitutionGroup(getRefQName(substitutionGroup, el));
        }

        element.minOccurs = getMinOccurs(el);
        element.maxOccurs = getMaxOccurs(el);

        //process extra attributes and elements
        processExtensibilityComponents(element,el);

        return element;
    }

    private XmlSchemaIdentityConstraint handleConstraint(
            Element constraintEl, String type) {

        try {
            XmlSchemaIdentityConstraint constraint =
                    (XmlSchemaIdentityConstraint) Class.forName("org.apache.ws.commons.schema.XmlSchema" + type).newInstance();

            if (constraintEl.hasAttribute("name"))
                constraint.name = constraintEl.getAttribute("name");

            if (constraintEl.hasAttribute("refer")) {
                String name = constraintEl.getAttribute("refer");
                ((XmlSchemaKeyref) constraint).refer = getRefQName(name, constraintEl);
            }
            for (Element el = XDOMUtil.getFirstChildElementNS(constraintEl,
                    XmlSchema.SCHEMA_NS);
                 el != null;
                 el = XDOMUtil.getNextSiblingElementNS(el, XmlSchema.SCHEMA_NS)) {

                //    String elPrefix = el.getPrefix() == null ? ""
                //     : el.getPrefix();
                //if(elPrefix.equals(schema.schema_ns_prefix)) {
                if (el.getLocalName().equals("selector")) {
                    XmlSchemaXPath selectorXPath =
                            new XmlSchemaXPath();
                    selectorXPath.xpath = el.getAttribute("xpath");

                    Element annotationEl =
                            XDOMUtil.getFirstChildElementNS(el, XmlSchema.SCHEMA_NS,
                                    "annotation");
                    if (annotationEl != null) {
                        XmlSchemaAnnotation annotation =
                                handleAnnotation(annotationEl);

                        selectorXPath.setAnnotation(annotation);
                    }
                    constraint.selector = selectorXPath;
                } else if (el.getLocalName().equals("field")) {
                    XmlSchemaXPath fieldXPath = new XmlSchemaXPath();
                    fieldXPath.xpath = el.getAttribute("xpath");
                    constraint.fields.add(fieldXPath);

                    Element annotationEl =
                            XDOMUtil.getFirstChildElementNS(el, XmlSchema.SCHEMA_NS,
                                    "annotation");

                    if (annotationEl != null) {
                        XmlSchemaAnnotation annotation =
                                handleAnnotation(annotationEl);

                        fieldXPath.setAnnotation(annotation);
                    }
                } else if (el.getLocalName().equals("annotation")) {
                    XmlSchemaAnnotation constraintAnnotation =
                            handleAnnotation(el);
                    constraint.setAnnotation(constraintAnnotation);
                }
            }
            return constraint;
        } catch (ClassNotFoundException e) {
            throw new XmlSchemaException(e.getMessage());
        } catch (InstantiationException e) {
            throw new XmlSchemaException(e.getMessage());
        } catch (IllegalAccessException e) {
            throw new XmlSchemaException(e.getMessage());
        }
    }

    XmlSchemaImport handleImport(XmlSchema schema, Element importEl,
                                 Element schemaEl) {

        XmlSchemaImport schemaImport = new XmlSchemaImport();

        Element annotationEl =
                XDOMUtil.getFirstChildElementNS(importEl, XmlSchema.SCHEMA_NS, "annotation");

        if (annotationEl != null) {
            XmlSchemaAnnotation importAnnotation =
                    handleAnnotation(annotationEl);
            schemaImport.setAnnotation(importAnnotation);
        }

        final String uri = schemaImport.namespace = importEl.getAttribute("namespace");
        schemaImport.schemaLocation =
                importEl.getAttribute("schemaLocation");

        TargetNamespaceValidator validator = new TargetNamespaceValidator(){
            private boolean isEmpty(String pValue) {
                return pValue == null  ||  Constants.NULL_NS_URI.equals(pValue);
            }
            public void validate(XmlSchema pSchema) {
                final boolean valid;
                if (isEmpty(uri)) {
                    valid = isEmpty(pSchema.syntacticalTargetNamespace);
                } else {
                    valid = pSchema.syntacticalTargetNamespace.equals(uri);
                }
                if (!valid) {
                    throw new XmlSchemaException("An imported schema was announced to have the namespace "
                            + uri + ", but has the namespace " +
                            pSchema.syntacticalTargetNamespace);
                }
            }
        };
        if ((schemaImport.schemaLocation != null) && (!schemaImport.schemaLocation.equals(""))) {
            if(schema.getSourceURI()!=null) {
                schemaImport.schema =
                        resolveXmlSchema(
                                uri,
                                schemaImport.schemaLocation,
                                schema.getSourceURI(),
                                validator);
            } else {
                schemaImport.schema =
                        resolveXmlSchema(
                                schemaImport.namespace,
                                schemaImport.schemaLocation,
                                validator);
            }
        }
        return schemaImport;
    }

    /**
     * Handles the include
     * @param schema
     * @param includeEl
     * @param schemaEl
     */
    XmlSchemaInclude handleInclude(final XmlSchema schema,
                                   Element includeEl, Element schemaEl) {

        XmlSchemaInclude include = new XmlSchemaInclude();

        Element annotationEl =
                XDOMUtil.getFirstChildElementNS(includeEl,
                        XmlSchema.SCHEMA_NS, "annotation");

        if (annotationEl != null) {
            XmlSchemaAnnotation includeAnnotation =
                    handleAnnotation(annotationEl);
            include.setAnnotation(includeAnnotation);
        }

        include.schemaLocation =
                includeEl.getAttribute("schemaLocation");

        //includes are not supposed to have a target namespace
        // we should be passing in a null in place of the target
        //namespace

        final TargetNamespaceValidator validator = newIncludeValidator(schema);
        if(schema.getSourceURI()!=null) {
            include.schema =
                    resolveXmlSchema(
                            schema.logicalTargetNamespace,
                            include.schemaLocation,
                            schema.getSourceURI(),
                            validator);
        } else {
            include.schema =
                    resolveXmlSchema(
                            schema.logicalTargetNamespace,
                            include.schemaLocation,
                            validator);
        }
        //process extra attributes and elements
        processExtensibilityComponents(include,includeEl);
        return include;
    }

    private TargetNamespaceValidator newIncludeValidator(final XmlSchema schema) {
        return new TargetNamespaceValidator(){
            private boolean isEmpty(String pValue) {
                return pValue == null  ||  Constants.NULL_NS_URI.equals(pValue);
            }
            public void validate(XmlSchema pSchema) {
                if (isEmpty(pSchema.syntacticalTargetNamespace)) {
                    pSchema.logicalTargetNamespace = schema.logicalTargetNamespace;
                } else {
                    if (!pSchema.syntacticalTargetNamespace.equals(schema.logicalTargetNamespace)) {
                        String msg = "An included schema was announced to have the default target namespace";
                        if (!isEmpty(schema.logicalTargetNamespace)) {
                            msg += " or the target namespace " + schema.logicalTargetNamespace;
                        }
                        throw new XmlSchemaException(msg + ", but has the target namespace "
                                + pSchema.logicalTargetNamespace);
                    }
                }
            }
        };
    }

    /**
     * Handles the annotation
     * Traversing if encounter appinfo or documentation
     * add it to annotation collection
     *
     */
    XmlSchemaAnnotation handleAnnotation(Element annotEl) {
        XmlSchemaObjectCollection content = new XmlSchemaObjectCollection();
        XmlSchemaAppInfo appInfoObj;
        XmlSchemaDocumentation docsObj;

        for (Element appinfo = XDOMUtil.getFirstChildElementNS(annotEl,
                XmlSchema.SCHEMA_NS, "appinfo");
             appinfo != null;
             appinfo = XDOMUtil.getNextSiblingElementNS(appinfo, XmlSchema.SCHEMA_NS, "appinfo")) {

            appInfoObj = handleAppInfo(appinfo);
            if (appInfoObj != null) {
                content.add(appInfoObj);
            }
        }
        for (Element documentation = XDOMUtil.getFirstChildElementNS(annotEl,
                XmlSchema.SCHEMA_NS, "documentation");
             documentation != null;
             documentation = XDOMUtil.getNextSiblingElementNS(documentation,


                     XmlSchema.SCHEMA_NS, "documentation")) {

            docsObj = handleDocumentation(documentation);
            if (docsObj != null) {
                content.add(docsObj);
            }
        }

        XmlSchemaAnnotation annotation = new XmlSchemaAnnotation();
        annotation.items = content;

        //process extra attributes and elements
        processExtensibilityComponents(annotation,annotEl);
        return annotation;
    }



    /**
     * create new XmlSchemaAppinfo and add value goten from element
     * to this obj
     * @param content
     */
    XmlSchemaAppInfo handleAppInfo(Element content) {
        XmlSchemaAppInfo appInfo = new XmlSchemaAppInfo();
        NodeList markup = getChild(content);

        if (!content.hasAttribute("source") &&
                (markup == null || markup.getLength() <= 0)) {
            return null;
        }
        appInfo.setSource(getAttribute(content, "source"));
        appInfo.setMarkup(markup);
        return appInfo;
    }

    //iterate each documentation element, create new XmlSchemaAppinfo and add to collection
    XmlSchemaDocumentation handleDocumentation(Element content) {
        XmlSchemaDocumentation documentation = new XmlSchemaDocumentation();
        NodeList markup = getChild(content);

        if (!content.hasAttribute("source") &&
                !content.hasAttribute("xml:lang") &&
                (markup == null || markup.getLength() <= 0))
            return null;

        documentation.setSource(getAttribute(content, "source"));
        documentation.setLanguage(getAttribute(content, "xml:lang"));
        documentation.setMarkup(getChild(content));

        return documentation;
    }

    private String getAttribute(Element content, String attrName) {
        if (content.hasAttribute(attrName))
            return content.getAttribute(attrName);
        return null;
    }

    private NodeList getChild(Element content) {
        NodeList childs = content.getChildNodes();
        if (childs.getLength() > 0)
            return childs;
        return null;
    }

    long getMinOccurs(Element el) {
        try {
            if (el.getAttributeNode("minOccurs") != null) {
                String value = el.getAttribute("minOccurs");
                if (value.equals("unbounded"))
                    return Long.MAX_VALUE;
                else
                    return Long.parseLong(value);
            }
            return 1;
        } catch (java.lang.NumberFormatException e) {
            return 1;
        }
    }

    long getMaxOccurs(Element el) {
        try {
            if (el.getAttributeNode("maxOccurs") != null) {
                String value = el.getAttribute("maxOccurs");
                if (value.equals("unbounded"))
                    return Long.MAX_VALUE;
                else
                    return Long.parseLong(value);
            }
            return 1;
        } catch (java.lang.NumberFormatException e) {
            return 1;
        }
    }

    XmlSchemaForm getFormDefault(Element el, String attrName) {
        if (el.getAttributeNode(attrName) != null) {
            String value = el.getAttribute(attrName);
            return new XmlSchemaForm(value);
        } else
            return new XmlSchemaForm("unqualified");
    }

    //Check value entered by user and change according to .net spec,
    //according to w3c spec have to be "#all"
    //but in .net the valid enum value is "all".
    XmlSchemaDerivationMethod getDerivation(Element el, String attrName) {
        if (el.hasAttribute(attrName) && !el.getAttribute(attrName).equals("")) {
            //#all | List of (extension | restriction | substitution
            String derivationMethod = el.getAttribute(attrName).trim();
            if (derivationMethod.equals("#all"))
                return new XmlSchemaDerivationMethod(Constants.BlockConstants.ALL);
            else
                return new XmlSchemaDerivationMethod(derivationMethod);
        }
        return new XmlSchemaDerivationMethod(Constants.BlockConstants.NONE);
    }

    //Check value entered by user and change according to .net spec, user
    String getEnumString(Element el, String attrName) {
        if (el.hasAttribute(attrName)) {
            return el.getAttribute(attrName).trim();
        }
        return Constants.BlockConstants.NONE;
    }

    /**
     * Resolve the schemas
     * @param targetNamespace
     * @param schemaLocation
     */
    XmlSchema resolveXmlSchema(String targetNamespace,
                               String schemaLocation,
                               String baseUri,
                               TargetNamespaceValidator validator) {
        //use the entity resolver provided
        InputSource source = collection.schemaResolver.
                resolveEntity(targetNamespace,schemaLocation,baseUri);

        final String systemId = source.getSystemId() == null ? schemaLocation : source.getSystemId();
        final SchemaKey key = new XmlSchemaCollection.SchemaKey(targetNamespace, systemId);
        XmlSchema schema = collection.getSchema(key);
        if (schema != null) {
            return schema;
        }
            try {
            return collection.read(source, null, validator);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

    /**
     * Resolve the schemas
     * @param targetNamespace
     * @param schemaLocation
     */
    XmlSchema resolveXmlSchema(String targetNamespace,
                               String schemaLocation,
                               TargetNamespaceValidator validator) {
        return resolveXmlSchema(targetNamespace, schemaLocation,
                collection.baseUri, validator);

    }

    /**
     * A generic method to process the extra attributes and the the extra
     * elements present within the schema.
     * What it does right now is to attach extra attributes to a map
     * having QName/value pairs and store the map in the metadata section
     * of the schema object
     * @param schemaObject
     * @param elt
     */
    private void processExtensibilityComponents(XmlSchemaObject schemaObject,Element elt){
        Map attribMap = new HashMap();
        NamedNodeMap attributes = elt.getAttributes();
        for (int i=0 ;i < attributes.getLength();i++){
            Attr attribute = (Attr)attributes.item(i);

            String namespaceURI = attribute.getNamespaceURI();
            String name = attribute.getName();

            if (namespaceURI!= null &&
                    !"".equals(namespaceURI) &&  //ignore unqualified attributes
                    !name.startsWith(Constants.XMLNS_ATTRIBUTE) && //ignore namespaces
                    !Constants.URI_2001_SCHEMA_XSD.equals(namespaceURI)){
                attribMap.put(new QName(namespaceURI,name),
                        attribute.getValue());
            }
        }

        if (!attribMap.isEmpty()){
            schemaObject.addMetaInfo(
                    Constants.MetaDataConstants.EXTERNAL_ATTRIBUTES,
                    attribMap
            );

        }

    }

}
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