JAXB compiler error : Complex Type Definition Representation Error

Question

Hi,
I have a problem when I try to generate Java classes for the XML Digital Signature schema along with the XAdES extension. Apparently, we got an XML validation issue when the XAdES schema is parsed.
Here is the xjc tool ouput :
[ERROR] src-ct.1: Complex Type Definition Representation Error for type 'IdentifierType'.  When complexContent is used, the base type must be a complexType.
  line 33 of XAdES.xsd
[ERROR] src-ct.1: Complex Type Definition Representation Error for type 'EncapsulatedPKIDataType'.  When complexContent is used, the base type must be a complexType.
  line 57 of XAdES.xsdNow these are the schema lines from XAdES.xsd that cause the problem :
<xsd:complexType name="IdentifierType">
  <xsd:complexContent>
    <xsd:extension base="xsd:anyURI">
      <xsd:attribute name="Qualifier" type="QualifierType" use="optional"/>
    </xsd:extension>
  </xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="EncapsulatedPKIDataType">
  <xsd:complexContent>
    <xsd:extension base="xsd:base64Binary">
      <xsd:attribute name="Id" type="xsd:ID" use="optional"/>
    </xsd:extension>
  </xsd:complexContent>
</xsd:complexType>The most disturbing thing is that those two schemas I used (e.g. xmldsig-core-schema.xsd and XAdES.xsd) come directly from the W3C, so they should be fully compliant to the XML schema spec, shouldn't they ?
Moreover, I tried to validate these two schemas with XML Spy 4.3 and the problem occurs in slightly different way. In fact, the <xsd:complexContent> tags are replaced silently by XML Spy with <xsd:simpleContent> tags in order to validate the schema. So XML Spy seems to have a problem too with these complex type definitions. Besides, if I replace the <xsd:complexContent> tags the same way as XML Spy does, and if I run again the JAXB compiler, it works fine...
Does anyone have any knowledge about this issue ? I'd like very much to hear about anyone who has experienced or better solved the same kind of issue.
By the way, here is the version of JAXB that I use :
xjc version "1.0.2-b15-fcs"
JavaTM Architecture for XML Binding(JAXB) Reference Implementation, (build 1.0.2-b15-fcs)Any help appreciated.
Thanks,
Gregory

Answer 1

<xsd:extension base="xsd:anyURI">
<xsd:extension base="xsd:base64Binary">
The base attribute of the xs:extension elements shoule refer to a complexType.
For example,
<xs:complexType name="complexTypeA">
</xs:complexType>
<xsd:complexType name="IdentifierType">
<xsd:complexContent>
<xsd:extension base="complexTypeA">
<xsd:attribute name="Qualifier" type="QualifierType" use="optional"/>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>