[xacml-comment] A schema bug?

Hello,

I got a schema validation error when I used Xerces 2.0.1 and 2.2.0.
I can resolve this by adding mixed="true" to <xs:complexType name
="AttributeAssignmentType">.
Is this a schema bug or Xerces's bug?

org.xml.sax.SAXParseException: cos-ct-extends.1.4.2.2.2.2.1: Error for type
'Att
ributeAssignmentType'.  The content type of a derived type and that of its
base
must both be mixed or element-only.
        at
org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Un
known Source)
        at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
        at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown
Source)
        at
org.apache.xerces.impl.xs.traversers.XSDHandler.reportSchemaError(Unk
nown Source)
        at
org.apache.xerces.impl.xs.traversers.XSDAbstractTraverser.reportSchem
aError(Unknown Source)
        at
org.apache.xerces.impl.xs.traversers.XSDComplexTypeTraverser.handleCo
mplexTypeError(Unknown Source)
        at
org.apache.xerces.impl.xs.traversers.XSDComplexTypeTraverser.traverse
ComplexTypeDecl(Unknown Source)
        at
org.apache.xerces.impl.xs.traversers.XSDComplexTypeTraverser.traverse
Global(Unknown Source)
        at
org.apache.xerces.impl.xs.traversers.XSDHandler.getGlobalDecl(Unknown
 Source)
        at
org.apache.xerces.impl.xs.traversers.XSDElementTraverser.traverseName
dElement(Unknown Source)
        at
org.apache.xerces.impl.xs.traversers.XSDElementTraverser.traverseGlob
al(Unknown Source)
        at
org.apache.xerces.impl.xs.traversers.XSDHandler.traverseSchemas(Unkno
wn Source)
        at
org.apache.xerces.impl.xs.traversers.XSDHandler.parseSchema(Unknown S
ource)
        at org.apache.xerces.impl.xs.XMLSchemaLoader.loadSchema(Unknown
Source)
        at
org.apache.xerces.impl.xs.XMLSchemaValidator.findSchemaGrammar(Unknow
n Source)
        at
org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement(Unkno
wn Source)
        at
org.apache.xerces.impl.xs.XMLSchemaValidator.startElement(Unknown Sou
rce)
        at
org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unkn
own Source)
        at
org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.s
canRootElementHook(Unknown Source)
        at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContent
Dispatcher.dispatch(Unknown Source)
        at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Un
known Source)
        at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
        at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
        at
javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:134)

Satoshi Hada
IBM Tokyo Research Laboratory
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