* Creates an empty styles for the document if one does not already exist
* @return styles
*/
public XWPFStyles createStyles() {
if(styles == null) {
StylesDocument stylesDoc = StylesDocument.Factory.newInstance();
XWPFRelation relation = XWPFRelation.STYLES;
int i = getRelationIndex(relation);
XWPFStyles wrapper = (XWPFStyles)createRelationship(relation, XWPFFactory.getInstance(), i);
wrapper.setStyles(stylesDoc.addNewStyles());
styles = wrapper;
}
return styles;
}