boolean extension,
Element elem)
throws ComplexTypeRecoverableError {
XSObjectList attrUseS = fromAttrGrp.getAttributeUses();
XSAttributeUseImpl duplicateAttrUse = null, oneAttrUse = null;
int attrCount = attrUseS.getLength();
for (int i=0; i<attrCount; i++) {
oneAttrUse = (XSAttributeUseImpl)attrUseS.item(i);
XSAttributeUse existingAttrUse = toAttrGrp.getAttributeUse(oneAttrUse.fAttrDecl.getNamespace(),
oneAttrUse.fAttrDecl.getName());