The XML Schema spec (http://www.w3.org/TR/xmlschema-1/#cos-all-limited) states that if the {term} property of a particle is a model group with {compositor} all then {maxOccurs} of that particle must equal 1. Xerces currently allows maxOccurs > 1 for references to a model group definition whose model group has {compositor} all, for instance:

<xs:group name="myGroup">
 <xs:all>
  <xs:element name="a"/>
  <xs:element name="b"/>
  <xs:element name="c"/>
 </xs:all>
</xs:group>

<xsd:complexType name="myInvalidType">
 <xsd:group ref="myGroup" maxOccurs="100">
</xsd:complexType>
"

This bug is causing 2 negative JCK test to fail:
xml_schema/msData/particles/jaxb/particlesEa025.html#particlesEa025
xml_schema/msData/particles/jaxp/particlesEa025.html#particlesEa025