/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2003 The Apache Software Foundation.  All rights 
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer. 
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:  
*       "This product includes software developed by the
*        Apache Software Foundation (http://www.apache.org/)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must 
*    not be used to endorse or promote products derived from this
*    software without prior written permission. For written 
*    permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache 
*    XMLBeans", nor may "Apache" appear in their name, without prior 
*    written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2000-2003 BEA Systems 
* Inc., <http://www.bea.com/>. For more information on the Apache Software
* Foundation, please see <http://www.apache.org/>.
*/

package org.apache.xmlbeans.impl.schema;

import java.util.*;
import java.util.List;
import java.math.BigInteger;

import org.w3.x2001.xmlSchema.*;
import org.w3.x2001.xmlSchema.SchemaDocument.Schema;
import org.w3.x2001.xmlSchema.RedefineDocument.Redefine;

import org.apache.xmlbeans.impl.common.XmlErrorContext;
import org.apache.xmlbeans.impl.common.QNameHelper;
import org.apache.xmlbeans.impl.common.XMLChar;
import org.apache.xmlbeans.impl.common.XPath;
import org.apache.xmlbeans.impl.values.XmlIntegerImpl;
import org.apache.xmlbeans.impl.values.XmlValueOutOfRangeException;
import org.apache.xmlbeans.impl.values.NamespaceContext;
import org.apache.xmlbeans.impl.regex.RegularExpression;
import org.apache.xmlbeans.soap.SOAPArrayType;
import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.XmlCursor;
import org.apache.xmlbeans.SchemaGlobalElement;
import org.apache.xmlbeans.SchemaType;
import org.apache.xmlbeans.SchemaParticle;
import org.apache.xmlbeans.QNameSet;
import org.apache.xmlbeans.QNameSetBuilder;
import org.apache.xmlbeans.SchemaIdentityConstraint;
import org.apache.xmlbeans.SchemaAttributeModel;
import org.apache.xmlbeans.SchemaLocalAttribute;
import org.apache.xmlbeans.SchemaGlobalAttribute;
import org.apache.xmlbeans.XmlAnySimpleType;
import org.apache.xmlbeans.XmlInteger;

import javax.xml.namespace.QName;

public class StscTranslator
{
    private static final QName WSDL_ARRAYTYPE_NAME =
        QNameHelper.forLNS("arrayType", "http://schemas.xmlsoap.org/wsdl/");

    public static void addAllDefinitions(StscImporter.SchemaToProcess[] schemasAndChameleons)
    {
        for (int i = 0; i < schemasAndChameleons.length; i++)
        {
            addAllDefinitions(
                schemasAndChameleons[i].getSchema(),
                schemasAndChameleons[i].getChameleonNamespace(),
                schemasAndChameleons[i].getRedefine());
        }
    }

    public static void addAllDefinitions(Schema schema, String givenTargetNamespace, Redefine redefine)
    {
        StscState state = StscState.get();

        // quick check for a few unsupported features

        if (schema.sizeOfNotationArray() > 0)
        {
            state.warning("Schema <notation> is not yet supported for this release.", XmlErrorContext.UNSUPPORTED_FEATURE, schema.getNotationArray(0));
        }
        
        // figure namespace (taking into account chameleons)
        String targetNamespace = schema.getTargetNamespace();
        boolean chameleon = false;
        if (givenTargetNamespace != null && targetNamespace == null)
        {
            targetNamespace = givenTargetNamespace;
            chameleon = true;
        }
        if (targetNamespace == null)
            targetNamespace = "";
        
        state.addNamespace(targetNamespace);

        // make a note of all redefinitions
        RedefinitionHolder redefinitions = new RedefinitionHolder(redefine);

        TopLevelComplexType[] complexTypes = schema.getComplexTypeArray();
        for (int i = 0; i < complexTypes.length; i++)
        {
            TopLevelComplexType redef = redefinitions.redefineComplexType(complexTypes[i].getName());
            state.addGlobalType(translateGlobalComplexType(complexTypes[i], targetNamespace, chameleon, false), redef != null);
            if (redef != null)
                state.addGlobalType(translateGlobalComplexType(redef, targetNamespace, chameleon, true), false);
        }

        TopLevelSimpleType[] simpleTypes = schema.getSimpleTypeArray();
        for (int i = 0; i < simpleTypes.length; i++)
        {
            TopLevelSimpleType redef = redefinitions.redefineSimpleType(simpleTypes[i].getName());
            state.addGlobalType(translateGlobalSimpleType(simpleTypes[i], targetNamespace, chameleon, false), redef != null);
            if (redef != null)
                state.addGlobalType(translateGlobalSimpleType(redef, targetNamespace, chameleon, true), false);
        }

        TopLevelElement[] elements = schema.getElementArray();
        for (int i = 0; i < elements.length; i++)
        {
            TopLevelElement element = elements[i];
            state.addDocumentType(translateDocumentType(element, targetNamespace, chameleon), QNameHelper.forLNS(element.getName(), targetNamespace));
        }

        TopLevelAttribute[] attributes = schema.getAttributeArray();
        for (int i = 0; i < attributes.length ; i++)
        {
            TopLevelAttribute attribute = attributes[i];
            state.addAttributeType(translateAttributeType(attribute, targetNamespace, chameleon), QNameHelper.forLNS(attribute.getName(), targetNamespace));
        }

        NamedGroup[] modelgroups = schema.getGroupArray();
        for (int i = 0; i < modelgroups.length; i++)
        {
            NamedGroup redef = redefinitions.redefineModelGroup(modelgroups[i].getName());
            state.addModelGroup(translateModelGroup(modelgroups[i], targetNamespace, chameleon, false), redef != null);
            if (redef != null)
                state.addModelGroup(translateModelGroup(redef, targetNamespace, chameleon, true), false);
        }

        NamedAttributeGroup[] attrgroups = schema.getAttributeGroupArray();
        for (int i = 0; i < attrgroups.length; i++)
        {
            NamedAttributeGroup redef = redefinitions.redefineAttributeGroup(attrgroups[i].getName());
            state.addAttributeGroup(translateAttributeGroup(attrgroups[i], targetNamespace, chameleon, false), redef != null);
            if (redef != null)
                state.addAttributeGroup(translateAttributeGroup(redef, targetNamespace, chameleon, true), false);
        }
        
        redefinitions.complainAboutMissingDefinitions();
    }
    
    private static class RedefinitionHolder
    {
        // record redefinitions
        private Map stRedefinitions = Collections.EMPTY_MAP;
        private Map ctRedefinitions = Collections.EMPTY_MAP;
        private Map agRedefinitions = Collections.EMPTY_MAP;
        private Map mgRedefinitions = Collections.EMPTY_MAP;
        private String schemaLocation = "";
        
        // first build set of redefined components
        RedefinitionHolder(Redefine redefine)
        {
            if (redefine != null)
            {
                StscState state = StscState.get();
            
                stRedefinitions = new HashMap();
                ctRedefinitions = new HashMap();
                agRedefinitions = new HashMap();
                mgRedefinitions = new HashMap();
                if (redefine.getSchemaLocation() != null)
                    schemaLocation = redefine.getSchemaLocation();
                
                TopLevelComplexType[] complexTypes = redefine.getComplexTypeArray();
                for (int i = 0; i < complexTypes.length; i++)
                {
                    if (complexTypes[i].getName() != null)
                    {
                        if (ctRedefinitions.containsKey(complexTypes[i].getName()))
                            state.error("Duplicate type redefinition: " + complexTypes[i].getName(), XmlErrorContext.DUPLICATE_GLOBAL_TYPE, null);
                        else
                            ctRedefinitions.put(complexTypes[i].getName(), complexTypes[i]);
                    }
                }
    
                TopLevelSimpleType[] simpleTypes = redefine.getSimpleTypeArray();
                for (int i = 0; i < simpleTypes.length; i++)
                {
                    if (simpleTypes[i].getName() != null)
                    {
                        if (stRedefinitions.containsKey(simpleTypes[i].getName()))
                            state.error("Duplicate type redefinition: " + simpleTypes[i].getName(), XmlErrorContext.DUPLICATE_GLOBAL_TYPE, null);
                        else
                            stRedefinitions.put(simpleTypes[i].getName(), simpleTypes[i]);
                    }
                }
                
                NamedGroup[] modelgroups = redefine.getGroupArray();
                for (int i = 0; i < modelgroups.length; i++)
                {
                    if (modelgroups[i].getName() != null)
                    {
                        if (mgRedefinitions.containsKey(modelgroups[i].getName()))
                            state.error("Duplicate type redefinition: " + modelgroups[i].getName(), XmlErrorContext.DUPLICATE_GLOBAL_TYPE, null);
                        else
                            mgRedefinitions.put(modelgroups[i].getName(), modelgroups[i]);
                    }
                }
    
                NamedAttributeGroup[] attrgroups = redefine.getAttributeGroupArray();
                for (int i = 0; i < attrgroups.length; i++)
                {
                    if (attrgroups[i].getName() != null)
                    {
                        if (agRedefinitions.containsKey(attrgroups[i].getName()))
                            state.error("Duplicate type redefinition: " + attrgroups[i].getName(), XmlErrorContext.DUPLICATE_GLOBAL_TYPE, null);
                        else
                            agRedefinitions.put(attrgroups[i].getName(), attrgroups[i]);
                    }
                }
            }
        }
        
        public TopLevelSimpleType redefineSimpleType(String name)
        {
            if (name == null || !stRedefinitions.containsKey(name))
                return null;
            return (TopLevelSimpleType)stRedefinitions.remove(name);
        }
        
        public TopLevelComplexType redefineComplexType(String name)
        {
            if (name == null || !ctRedefinitions.containsKey(name))
                return null;
            return (TopLevelComplexType)ctRedefinitions.remove(name);
        }
        
        public NamedGroup redefineModelGroup(String name)
        {
            if (name == null || !mgRedefinitions.containsKey(name))
                return null;
            return (NamedGroup)mgRedefinitions.remove(name);
        }
        
        public NamedAttributeGroup redefineAttributeGroup(String name)
        {
            if (name == null || !agRedefinitions.containsKey(name))
                return null;
            return (NamedAttributeGroup)agRedefinitions.remove(name);
        }
        
        public void complainAboutMissingDefinitions()
        {
            if (stRedefinitions.isEmpty() && ctRedefinitions.isEmpty() &&
                    agRedefinitions.isEmpty() && mgRedefinitions.isEmpty())
                return;
            
            StscState state = StscState.get();
            
            for (Iterator i = stRedefinitions.keySet().iterator(); i.hasNext(); )
            {
                QName name = (QName)i.next();
                state.error("Redefined simple type " + QNameHelper.pretty(name) + " not found in " + schemaLocation, XmlErrorContext.GENERIC_ERROR, (XmlObject)stRedefinitions.get(name));
            }

            for (Iterator i = ctRedefinitions.keySet().iterator(); i.hasNext(); )
            {
                QName name = (QName)i.next();
                state.error("Redefined complex type " + QNameHelper.pretty(name) + " not found in " + schemaLocation, XmlErrorContext.GENERIC_ERROR, (XmlObject)ctRedefinitions.get(name));
            }
            
            for (Iterator i = agRedefinitions.keySet().iterator(); i.hasNext(); )
            {
                QName name = (QName)i.next();
                state.error("Redefined attribute group " + QNameHelper.pretty(name) + " not found in " + schemaLocation, XmlErrorContext.GENERIC_ERROR, (XmlObject)agRedefinitions.get(name));
            }
            
            for (Iterator i = mgRedefinitions.keySet().iterator(); i.hasNext(); )
            {
                QName name = (QName)i.next();
                state.error("Redefined model group " + QNameHelper.pretty(name) + " not found in " + schemaLocation, XmlErrorContext.GENERIC_ERROR, (XmlObject)mgRedefinitions.get(name));
            }
        }
    }

    private static String findFilename(XmlObject xobj)
    {
        return StscState.get().sourceNameForUri(xobj.documentProperties().getSourceName());
    }

    private static SchemaTypeImpl translateDocumentType ( TopLevelElement xsdType, String targetNamespace, boolean chameleon )
    {
        SchemaTypeImpl sType = new SchemaTypeImpl( StscState.get().sts() );
        
        sType.setDocumentType(true);
        sType.setParseContext( xsdType, targetNamespace, chameleon, false);
        sType.setFilename( findFilename( xsdType ) );

        return sType;
    }
    
    private static SchemaTypeImpl translateAttributeType ( TopLevelAttribute xsdType, String targetNamespace, boolean chameleon )
    {
        SchemaTypeImpl sType = new SchemaTypeImpl( StscState.get().sts() );
        
        sType.setAttributeType(true);
        sType.setParseContext( xsdType, targetNamespace, chameleon, false);
        sType.setFilename( findFilename( xsdType ) );
        
        return sType;
    }
    
    private static SchemaTypeImpl translateGlobalComplexType(TopLevelComplexType xsdType, String targetNamespace, boolean chameleon, boolean redefinition)
    {
        StscState state = StscState.get();

        String localname = xsdType.getName();
        if (localname == null)
        {
            state.error("Global type missing a name", XmlErrorContext.GLOBAL_TYPE_MISSING_NAME, xsdType);
            // recovery: ignore unnamed types.
            return null;
        }
        if (!XMLChar.isValidNCName(localname))
        {
            state.error("Invalid type name \"" + localname + "\"", XmlErrorContext.INVALID_NAME, xsdType.xgetName());
            // recovery: let the name go through anyway.
        }

        QName name = QNameHelper.forLNS(localname, targetNamespace);
        
        if (isReservedTypeName(name))
        {
            state.warning("Skipping definition of built-in type " + QNameHelper.pretty(name), XmlErrorContext.RESERVED_TYPE_NAME, xsdType);
            return null;
        }
        // System.err.println("Recording type " + QNameHelper.pretty(name));

        SchemaTypeImpl sType = new SchemaTypeImpl(state.sts());
        sType.setParseContext(xsdType, targetNamespace, chameleon, redefinition);
        sType.setFilename(findFilename(xsdType));
        sType.setName(QNameHelper.forLNS(localname, targetNamespace));
        return sType;
    }

    private static SchemaTypeImpl translateGlobalSimpleType(TopLevelSimpleType xsdType, String targetNamespace, boolean chameleon, boolean redefinition)
    {
        StscState state = StscState.get();

        String localname = xsdType.getName();
        if (localname == null)
        {
            state.error("Global type missing a name", XmlErrorContext.GLOBAL_TYPE_MISSING_NAME, xsdType);
            // recovery: ignore unnamed types.
            return null;
        }
        if (!XMLChar.isValidNCName(localname))
        {
            state.error("Invalid type name \"" + localname + "\"", XmlErrorContext.INVALID_NAME, xsdType.xgetName());
            // recovery: let the name go through anyway.
        }
        
        QName name = QNameHelper.forLNS(localname, targetNamespace);
        
        if (isReservedTypeName(name))
        {
            state.warning("Skipping definition of built-in type " + QNameHelper.pretty(name), XmlErrorContext.RESERVED_TYPE_NAME, xsdType);
            return null;
        }
        // System.err.println("Recording type " + QNameHelper.pretty(name));

        SchemaTypeImpl sType = new SchemaTypeImpl(state.sts());
        sType.setSimpleType(true);
        sType.setParseContext(xsdType, targetNamespace, chameleon, redefinition);
        sType.setFilename(findFilename(xsdType));
        sType.setName(name);
        return sType;
    }

    static FormChoice findElementFormDefault(XmlObject obj)
    {
        XmlCursor cur = obj.newCursor();
        while (cur.getObject().schemaType() != Schema.type)
            if (!cur.toParent())
                return null;
        return ((Schema)cur.getObject()).xgetElementFormDefault();
    }

    public static boolean uriMatch(String s1, String s2)
    {
        if (s1 == null)
            return s2 == null || s2.equals("");
        if (s2 == null)
            return s1.equals("");
        return s1.equals(s2);
    }

    public static void copyGlobalElementToLocalElement(SchemaGlobalElement referenced, SchemaLocalElementImpl target )
    {

        target.setNameAndTypeRef(referenced.getName(), referenced.getType().getRef());
        target.setNillable(referenced.isNillable());
        target.setDefault(referenced.getDefaultText(), referenced.isFixed(), ((SchemaGlobalElementImpl)referenced).getParseObject());
        target.setIdentityConstraints(((SchemaLocalElementImpl)referenced).getIdentityConstraintRefs());
        target.setBlock(referenced.blockExtension(),  referenced.blockRestriction(),  referenced.blockSubstitution());
        target.setAbstract(referenced.isAbstract());
        target.setTransitionRules(((SchemaParticle)referenced).acceptedStartNames(),
            ((SchemaParticle)referenced).isSkippable());
    }

    public static void copyGlobalAttributeToLocalAttribute(SchemaGlobalAttributeImpl referenced, SchemaLocalAttributeImpl target )
    {
        target.init(
            referenced.getName(), referenced.getTypeRef(), referenced.getUse(),
            referenced.getDefaultText(),
                referenced.getParseObject(), referenced._defaultValue,
            referenced.isFixed(),
            referenced.getWSDLArrayType() );
    }

    /**
     * Translates a local or global schema element.
     */
    public static SchemaLocalElementImpl translateElement(
        Element xsdElt, String targetNamespace, boolean chameleon,
        List anonymousTypes, SchemaType outerType)
    {
        StscState state = StscState.get();

        SchemaTypeImpl sgHead = null;

        // translate sg head
        if (xsdElt.isSetSubstitutionGroup())
        {
            sgHead = state.findDocumentType(xsdElt.getSubstitutionGroup(),
                ((SchemaTypeImpl)outerType).getChameleonNamespace());

            if (sgHead != null)
                StscResolver.resolveType(sgHead);
        }

        String name = xsdElt.getName();
        QName ref = xsdElt.getRef();


        if (ref != null && name != null)
        {
            // if (name.equals(ref.getLocalPart()) && uriMatch(targetNamespace, ref.getNamespaceURI()))
            //     state.warning("Element " + name + " specifies both a ref and a name", XmlErrorContext.ELEMENT_EXTRA_REF, xsdElt.xgetRef());
            // else
                state.error("Element " + name + " specifies both a ref and a name", XmlErrorContext.ELEMENT_EXTRA_REF, xsdElt.xgetRef());
            // ignore name
            name = null;
        }
        if (ref == null && name == null)
        {
            state.error("Element has no name", XmlErrorContext.ELEMENT_MISSING_NAME, xsdElt);
            // recovery: ignore this element
            return null;
        }
        if (name != null && !XMLChar.isValidNCName(name))
        {
            state.error("Invalid element name \"" + name + "\"", XmlErrorContext.INVALID_NAME, xsdElt.xgetName());
            // recovery: let the name go through anyway.
        }

        if (ref != null)
        {
            if (xsdElt.getType() != null || xsdElt.getSimpleType() != null || xsdElt.getComplexType() != null)
            {
                state.error("Element reference cannot also specify a type", XmlErrorContext.INVALID_NAME, xsdElt.xgetName());
                // recovery: let the name go through anyway.
            }
            
            if (xsdElt.getForm() != null)
            {
                state.error("Element reference cannot also specify form", XmlErrorContext.INVALID_NAME, xsdElt.xgetName());
                // recovery: let the name go through anyway.
            }
            
            assert(xsdElt instanceof LocalElement);
            SchemaGlobalElement referenced = state.findGlobalElement(ref, chameleon ? targetNamespace : null);
            if (referenced == null)
            {
                state.notFoundError(ref, XmlErrorContext.ELEMENT_REF_NOT_FOUND, xsdElt.xgetRef());
                // recovery: ignore this element
                return null;
            }
            SchemaLocalElementImpl target = new SchemaLocalElementImpl();
            target.setParticleType(SchemaParticle.ELEMENT);
            copyGlobalElementToLocalElement( referenced, target );
            return target;
        }

        QName qname;
        SchemaLocalElementImpl impl;
        SchemaType sType = null;

        if (xsdElt instanceof LocalElement)
        {
            impl = new SchemaLocalElementImpl();
            FormChoice form = xsdElt.xgetForm();
            if (form == null)
                form = findElementFormDefault(xsdElt);
            if (form == null || form.getStringValue().equals("unqualified"))
                qname = QNameHelper.forLN(name);
            else
                qname = QNameHelper.forLNS(name, targetNamespace);
        }
        else
        {
            SchemaGlobalElementImpl gelt = new SchemaGlobalElementImpl(state.sts());
            impl = gelt;

            // Set subst group head
            if (sgHead != null)
            {
                SchemaGlobalElementImpl head = state.findGlobalElement(xsdElt.getSubstitutionGroup(), chameleon ? targetNamespace : null);
                if (head != null)
                    gelt.setSubstitutionGroup(head.getRef());
            }

            // Set subst group members
            qname = QNameHelper.forLNS(name, targetNamespace);
            SchemaTypeImpl docType = (SchemaTypeImpl)outerType;

            QName[] sgMembers = docType.getSubstitutionGroupMembers();
            QNameSetBuilder transitionRules = new QNameSetBuilder();
            transitionRules.add(qname);

            for (int i = 0 ; i < sgMembers.length ; i++)
            {
                gelt.addSubstitutionGroupMember(sgMembers[i]);
                transitionRules.add(sgMembers[i]);
            }

            impl.setTransitionRules(QNameSet.forSpecification(transitionRules), false);
            impl.setTransitionNotes(QNameSet.EMPTY, true);

            boolean finalExt = false;
            boolean finalRest = false;
            Object ds = xsdElt.getFinal();
            if (ds != null)
            {
                if (ds instanceof String && ds.equals("#all"))
                {
                    // #ALL value
                    finalExt = finalRest = true;
                }
                else if (ds instanceof List)
                {
                    if (((List)ds).contains("extension"))
                        finalExt = true;
                    if (((List)ds).contains("restriction"))
                        finalRest = true;
                }
            }

            gelt.setFinal(finalExt, finalRest);
            gelt.setAbstract(xsdElt.getAbstract());
            gelt.setFilename(findFilename(xsdElt));
            gelt.setParseContext(xsdElt, targetNamespace, chameleon);
        }

        if (xsdElt.getType() != null)
        {
            sType = state.findGlobalType(xsdElt.getType(), chameleon ? targetNamespace : null );
            if (sType == null)
                state.notFoundError(xsdElt.getType(), XmlErrorContext.TYPE_NOT_FOUND, xsdElt.xgetType());
        }

        boolean simpleTypedef = false;
        XmlObject typedef = xsdElt.getComplexType();
        if (typedef == null)
        {
            typedef = xsdElt.getSimpleType();
            simpleTypedef = true;
        }

        if ((sType != null) && typedef != null)
        {
            state.error("Illegal to define a nested type when a type attribute is specified", XmlErrorContext.REDUNDANT_NESTED_TYPE, typedef);
            typedef = null;
        }

        if (typedef != null)
        {
            SchemaTypeImpl sTypeImpl = new SchemaTypeImpl(state.sts());
            sType = sTypeImpl;
            sTypeImpl.setContainerField(impl);
            sTypeImpl.setOuterSchemaTypeRef(outerType == null ? null : outerType.getRef());
            // leave the anonymous type unresolved: it will be resolved later.
            anonymousTypes.add(sType);
            sTypeImpl.setSimpleType(simpleTypedef);
            sTypeImpl.setParseContext(typedef, targetNamespace, chameleon, false);
        }

        if (sType == null)
        {
            // type may inherit from substitution group head
            if (sgHead != null)
            {
                SchemaGlobalElement head = state.findGlobalElement(xsdElt.getSubstitutionGroup(), chameleon ? targetNamespace : null);

                // Bug - Do I need to copy the type if it's anonymous?
                // If element does not exist, error has already been reported
                if (head != null)
                    sType = head.getType();
            }

        }


        if (sType == null)
            sType = BuiltinSchemaTypeSystem.ST_ANY_TYPE;

        SOAPArrayType wat = null;
        XmlCursor c = xsdElt.newCursor();
        String arrayType = c.getAttributeText(WSDL_ARRAYTYPE_NAME);
        c.dispose();
        if (arrayType != null)
        {
            wat = new SOAPArrayType(arrayType, new NamespaceContext(xsdElt));
        }
        impl.setWsdlArrayType(wat);

        boolean isFixed = xsdElt.isSetFixed();
        if (xsdElt.isSetDefault() && isFixed)
        {
            state.error("Should not set both default and fixed on the same element", XmlErrorContext.REDUNDANT_DEFAULT_FIXED, xsdElt.xgetFixed());
            // recovery: ignore fixed
            isFixed = false;
        }
        impl.setParticleType(SchemaParticle.ELEMENT);
        impl.setNameAndTypeRef(qname, sType.getRef());
        impl.setNillable(xsdElt.getNillable());
        impl.setDefault(isFixed ? xsdElt.getFixed() : xsdElt.getDefault(), isFixed, xsdElt);

        Object block = xsdElt.getBlock();
        boolean blockExt = false;
        boolean blockRest = false;
        boolean blockSubst = false;

        if (block != null)
        {
            if (block instanceof String && block.equals("#all"))
            {
                // #ALL value
                blockExt = blockRest = blockSubst = true;
            }
            else if (block instanceof List)
            {
                if (((List)block).contains("extension"))
                    blockExt = true;
                if (((List)block).contains("restriction"))
                    blockRest = true;
                if (((List)block).contains("substitution"))
                    blockSubst = true;
            }
        }
        
        impl.setBlock(blockExt, blockRest, blockSubst);

        boolean constraintFailed = false;

        // Translate Identity constraints

        int length = xsdElt.sizeOfKeyArray() + xsdElt.sizeOfKeyrefArray() + xsdElt.sizeOfUniqueArray();
        SchemaIdentityConstraintImpl[] constraints = new SchemaIdentityConstraintImpl[length];
        int cur = 0;

        // Handle key constraints
        Keybase[] keys = xsdElt.getKeyArray();
        for (int i = 0 ; i < keys.length ; i++, cur++) {
            constraints[cur] = translateIdentityConstraint(keys[i], targetNamespace, chameleon);
            if (constraints[cur] != null)
                constraints[cur].setConstraintCategory(SchemaIdentityConstraint.CC_KEY);
            else
                constraintFailed = true;
        }

        // Handle unique constraints
        Keybase[] uc = xsdElt.getUniqueArray();
        for (int i = 0 ; i < uc.length ; i++, cur++) {
            constraints[cur] = translateIdentityConstraint(uc[i], targetNamespace, chameleon);
            if (constraints[cur] != null)
                constraints[cur].setConstraintCategory(SchemaIdentityConstraint.CC_UNIQUE);
            else
                constraintFailed = true;
        }

        // Handle keyref constraints
        KeyrefDocument.Keyref[] krs = xsdElt.getKeyrefArray();
        for (int i = 0 ; i < krs.length ; i++, cur++) {
            constraints[cur] = translateIdentityConstraint(krs[i], targetNamespace, chameleon);
            if (constraints[cur] != null)
                constraints[cur].setConstraintCategory(SchemaIdentityConstraint.CC_KEYREF);
            else
                constraintFailed = true;
        }

        if (!constraintFailed)
        {
            SchemaIdentityConstraint.Ref[] refs = new SchemaIdentityConstraint.Ref[length];
            for (int i = 0 ; i < refs.length ; i++)
                refs[i] = constraints[i].getRef();

            impl.setIdentityConstraints(refs);
        }

        return impl;
    }
    
    private static String removeWhitespace(String xpath)
    {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < xpath.length(); i++)
        {
            char ch = xpath.charAt(i);
            if (XMLChar.isSpace(ch))
                continue;
            sb.append(ch);
        }
        return sb.toString();
    }
    
    public static final org.apache.xmlbeans.impl.regex.RegularExpression XPATH_REGEXP = new org.apache.xmlbeans.impl.regex.RegularExpression("(\\.//)?((((child::)?((\\i\\c*:)?(\\i\\c*|\\*)))|\\.)/)*((((child::)?((\\i\\c*:)?(\\i\\c*|\\*)))|\\.)|((attribute::|@)((\\i\\c*:)?(\\i\\c*|\\*))))(\\|(\\.//)?((((child::)?((\\i\\c*:)?(\\i\\c*|\\*)))|\\.)/)*((((child::)?((\\i\\c*:)?(\\i\\c*|\\*)))|\\.)|((attribute::|@)((\\i\\c*:)?(\\i\\c*|\\*)))))*", "X");
    
    private static boolean checkXPathSyntax(String xpath)
    {
        if (xpath == null)
            return false;
        
        // strip whitespace from xpath
        xpath = removeWhitespace(xpath);
        
        // apply regexp
        synchronized (XPATH_REGEXP)
        {
            return (XPATH_REGEXP.matches(xpath));
        }
    }

    private static SchemaIdentityConstraintImpl translateIdentityConstraint(Keybase parseIC, 
        String targetNamespace, boolean chameleon)
    {
        StscState state = StscState.get();
        
        // first do some checking
        String selector = parseIC.getSelector() == null ? null : parseIC.getSelector().getXpath();
        if (!checkXPathSyntax(selector))
        {
            StscState.get().error("Invalid xpath in selector.",
                XmlErrorContext.XPATH_COMPILATION_FAILURE, parseIC.getSelector().xgetXpath());
            return null;
        }
        
        FieldDocument.Field[] fieldElts = parseIC.getFieldArray();
        for (int j = 0; j < fieldElts.length; j++)
        {
            if (!checkXPathSyntax(fieldElts[j].getXpath()))
            {
                StscState.get().error("Invalid xpath in field.",
                    XmlErrorContext.XPATH_COMPILATION_FAILURE, fieldElts[j].xgetXpath());
                return null;
            }
        }
        
        // then translate.
        SchemaIdentityConstraintImpl ic = new SchemaIdentityConstraintImpl(state.sts());
        ic.setName(QNameHelper.forLNS(parseIC.getName(), targetNamespace));
        ic.setSelector(parseIC.getSelector().getXpath());
        ic.setParseContext(parseIC, targetNamespace, chameleon);

        // Set the ns map
        XmlCursor c = parseIC.newCursor();
        Map nsMap = new HashMap();

        c.getAllNamespaces(nsMap);
        nsMap.remove(""); // Remove the default mapping. This cannot be used by the xpath expressions.
        ic.setNSMap(nsMap);
        c.dispose();

        String[] fields = new String[fieldElts.length];
        for (int j = 0 ; j < fields.length ; j++)
            fields[j] = fieldElts[j].getXpath();
        ic.setFields(fields);

        try {
            ic.buildPaths();
        }
        catch (XPath.XPathCompileException e) {
            StscState.get().error("Invalid xpath in identity constraint: " + e.getMessage(),
                XmlErrorContext.XPATH_COMPILATION_FAILURE, parseIC);

            return null;
        }

        state.addIdConstraint(ic);

        return ic;

    }

    public static SchemaModelGroupImpl translateModelGroup(NamedGroup namedGroup, String targetNamespace, boolean chameleon, boolean redefinition)
    {
        String name = namedGroup.getName();
        if (name == null)
        {
            StscState.get().error("Model groups must be named", XmlErrorContext.MODEL_GROUP_MISSING_NAME, namedGroup);
            return null;
        }
        SchemaModelGroupImpl result = new SchemaModelGroupImpl(StscState.get().sts());
        result.init(QNameHelper.forLNS(name, targetNamespace), targetNamespace, chameleon, redefinition, namedGroup);
        return result;
    }

    public static SchemaAttributeGroupImpl translateAttributeGroup(AttributeGroup attrGroup, String targetNamespace, boolean chameleon, boolean redefinition)
    {
        String name = attrGroup.getName();
        if (name == null)
        {
            StscState.get().error("Attribute groups must be named", XmlErrorContext.ATTRIBUTE_GROUP_MISSING_NAME, attrGroup);
            return null;
        }
        SchemaAttributeGroupImpl result = new SchemaAttributeGroupImpl(StscState.get().sts());
        result.init(QNameHelper.forLNS(name, targetNamespace), targetNamespace, chameleon, redefinition, attrGroup);
        return result;
    }

    static FormChoice findAttributeFormDefault(XmlObject obj)
    {
        XmlCursor cur = obj.newCursor();
        while (cur.getObject().schemaType() != Schema.type)
            if (!cur.toParent())
                return null;
        return ((Schema)cur.getObject()).xgetAttributeFormDefault();
    }

    static SchemaLocalAttributeImpl translateAttribute(
        Attribute xsdAttr, String targetNamespace, boolean chameleon, List anonymousTypes,
        SchemaType outerType, SchemaAttributeModel baseModel, boolean local)
    {
        StscState state = StscState.get();

        String name = xsdAttr.getName();
        QName ref = xsdAttr.getRef();

        if (ref != null && name != null)
        {
            if (name.equals(ref.getLocalPart()) && uriMatch(targetNamespace, ref.getNamespaceURI()))
                state.warning("Attribute " + name + " specifies both a ref and a name", XmlErrorContext.ELEMENT_EXTRA_REF, xsdAttr.xgetRef());
            else
                state.error("Attribute " + name + " specifies both a ref and a name", XmlErrorContext.ELEMENT_EXTRA_REF, xsdAttr.xgetRef());
            // ignore name
            name = null;
        }
        if (ref == null && name == null)
        {
            state.error("Attribute has no name", XmlErrorContext.ELEMENT_MISSING_NAME, xsdAttr);
            // recovery: ignore this element
            return null;
        }
        if (name != null && !XMLChar.isValidNCName(name))
        {
            state.error("Invalid attribute name \"" + name + "\"", XmlErrorContext.INVALID_NAME, xsdAttr.xgetName());
            // recovery: let the name go through anyway.
        }

        boolean isFixed = false;
        String deftext = null;
        QName qname;
        SchemaLocalAttributeImpl sAttr;
        SchemaType sType = null;
        int use = SchemaLocalAttribute.OPTIONAL;

        if (local)
            sAttr = new SchemaLocalAttributeImpl();
        else
        {
            sAttr = new SchemaGlobalAttributeImpl(state.sts());
            ((SchemaGlobalAttributeImpl)sAttr).setParseContext(xsdAttr, targetNamespace, chameleon);
        }

        if (ref != null)
        {
            if (xsdAttr.getType() != null || xsdAttr.getSimpleType() != null)
            {
                state.error("Attribute reference cannot also specify type", XmlErrorContext.INVALID_NAME, xsdAttr);
                // recovery: ignore type, simpleType
            }
            
            if (xsdAttr.getForm() != null)
            {
                state.error("Attribute reference cannot also specify form", XmlErrorContext.INVALID_NAME, xsdAttr);
                // recovery: ignore form
            }
            
            SchemaGlobalAttribute referenced = state.findGlobalAttribute(ref, chameleon ? targetNamespace : null);
            if (referenced == null)
            {
                state.notFoundError(ref, XmlErrorContext.ATTRIBUTE_REF_NOT_FOUND, xsdAttr.xgetRef());
                // recovery: ignore this element
                return null;
            }

            qname = ref;
            use = referenced.getUse();
            sType = referenced.getType();
            deftext = referenced.getDefaultText();
            if (deftext != null)
            {
                isFixed = referenced.isFixed();
            }
        }
        else
        {
            if (local)
            {
                FormChoice form = xsdAttr.xgetForm();
                if (form == null)
                    form = findAttributeFormDefault(xsdAttr);
                if (form == null || form.getStringValue().equals("unqualified"))
                    qname = QNameHelper.forLN(name);
                else
                    qname = QNameHelper.forLNS(name, targetNamespace);
            }
            else
            {
                qname = QNameHelper.forLNS(name, targetNamespace);
            }

            if (xsdAttr.getType() != null)
            {
                sType = state.findGlobalType(xsdAttr.getType(), chameleon ? targetNamespace : null );
                if (sType == null)
                    state.notFoundError(xsdAttr.getType(), XmlErrorContext.TYPE_NOT_FOUND, xsdAttr.xgetType());
            }
            
            if (qname.getNamespaceURI().equals("http://www.w3.org/2001/XMLSchema-instance"))
            {
                state.error("Illegal namespace for attribute declaration.", XmlErrorContext.INVALID_NAME, xsdAttr.xgetName());
            }
            
            if (qname.getNamespaceURI().length() == 0 && qname.getLocalPart().equals("xmlns"))
            {
                state.error("Illegal name for attribute declaration.", XmlErrorContext.INVALID_NAME, xsdAttr.xgetName());
            }
            
            XmlObject typedef = xsdAttr.getSimpleType();

            if ((sType != null) && typedef != null)
            {
                state.error("Illegal to define a nested type when a type attribute is specified", XmlErrorContext.REDUNDANT_NESTED_TYPE, typedef);
                typedef = null;
            }

            if (typedef != null)
            {
                SchemaTypeImpl sTypeImpl = new SchemaTypeImpl(state.sts());
                sType = sTypeImpl;
                sTypeImpl.setContainerField(sAttr);
                sTypeImpl.setOuterSchemaTypeRef(outerType == null ? null : outerType.getRef());
                // leave the anonymous type unresolved: it will be resolved later.
                anonymousTypes.add(sType);
                sTypeImpl.setSimpleType(true);
                sTypeImpl.setParseContext(typedef, targetNamespace, chameleon, false);
            }
            
            if (sType == null && baseModel != null && baseModel.getAttribute(qname) != null)
                sType = baseModel.getAttribute(qname).getType();
        }

        if (sType == null)
            sType = BuiltinSchemaTypeSystem.ST_ANY_SIMPLE;

        if (!sType.isSimpleType())
        {
            state.error("Attributes must have a simple type (not complex).", XmlErrorContext.INVALID_SCHEMA, xsdAttr);
            // recovery: switch to the any-type
            sType = BuiltinSchemaTypeSystem.ST_ANY_SIMPLE;
        }
        
        if (xsdAttr.isSetUse())
        {
            use = translateUseCode(xsdAttr.xgetUse());
            
            // ignore referenced default if no longer optional
            if (use != SchemaLocalAttribute.OPTIONAL && !isFixed)
                deftext = null;
        }
        
        if (xsdAttr.isSetDefault() || xsdAttr.isSetFixed())
        {
            if (isFixed && !xsdAttr.isSetFixed())
                state.error("A use of a fixed attribute definition must also be fixed", XmlErrorContext.REDUNDANT_DEFAULT_FIXED, xsdAttr.xgetFixed());
            
            isFixed = xsdAttr.isSetFixed();
            
            if (xsdAttr.isSetDefault() && isFixed)
            {
                state.error("Should not set both default and fixed on the same attribute", XmlErrorContext.REDUNDANT_DEFAULT_FIXED, xsdAttr.xgetFixed());
                // recovery: ignore fixed
                isFixed = false;
            }
            deftext = isFixed ? xsdAttr.getFixed() : xsdAttr.getDefault();
        }

        if (!local)
        {
            ((SchemaGlobalAttributeImpl)sAttr).setFilename(findFilename(xsdAttr));
        }

        SOAPArrayType wat = null;
        XmlCursor c = xsdAttr.newCursor();
        String arrayType = c.getAttributeText(WSDL_ARRAYTYPE_NAME);
        c.dispose();
        if (arrayType != null)
        {
            wat = new SOAPArrayType(arrayType, new NamespaceContext(xsdAttr));
        }

        sAttr.init(
            qname,
            sType.getRef(),
            use,
            deftext, xsdAttr, null, isFixed,
            wat);

        return sAttr;
    }

    static int translateUseCode(Attribute.Use attruse)
    {
        if (attruse == null)
            return SchemaLocalAttribute.OPTIONAL;

        String val = attruse.getStringValue();
        if (val.equals("optional"))
            return SchemaLocalAttribute.OPTIONAL;
        if (val.equals("required"))
            return SchemaLocalAttribute.REQUIRED;
        if (val.equals("prohibited"))
            return SchemaLocalAttribute.PROHIBITED;
        return SchemaLocalAttribute.OPTIONAL;
    }

    static XmlInteger buildNnInteger(XmlAnySimpleType value)
    {
        if (value == null)
            return null;
        String text = value.getStringValue();
        BigInteger bigInt;
        try
        {
            bigInt = new BigInteger(text);
        }
        catch (NumberFormatException e)
        {
            StscState.get().error("Must be nonnegative integer", XmlErrorContext.MALFORMED_NUMBER, value);
            return null;
        }

        if (bigInt.signum() < 0)
        {
            StscState.get().error("Must be nonnegative integer", XmlErrorContext.MALFORMED_NUMBER, value);
            return null;
        }
        try
        {
            XmlIntegerImpl i = new XmlIntegerImpl();
            i.set(bigInt);
            i.setImmutable();
            return i;
        }
        catch (XmlValueOutOfRangeException e)
        {
            StscState.get().error("Internal error processing number", XmlErrorContext.MALFORMED_NUMBER, value);
            return null;
        }
    }

    private static boolean isReservedTypeName(QName name)
    {
        return (BuiltinSchemaTypeSystem.get().findType(name) != null);
    }
}