*/
public VPFLibrary(File dir, URI namespace) throws IOException, SchemaException {
// read libraries info
String vpfTableName = new File(dir, LIBRARY_HEADER_TABLE).toString();
VPFFile lhtFile = VPFFileFactory.getInstance().getFile(vpfTableName);
lhtFile.reset();
this.namespace = namespace;
try {
lhtFile.readFeature(); // check for errors
} catch (IllegalAttributeException exc) {
exc.printStackTrace();