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https://issues.apache.org/jira/browse/XERCESJ-1615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13800670#comment-13800670
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Octavian Nadolu commented on XERCESJ-1615:
------------------------------------------

The fix works fine. 
But I found another case where Xerces should report "duplicate attribute 
group". If you validate the following schema, an error should be reported on 
"myType" because the attribute group is referred twice.


-------- schema.xsd ------------------------
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"; 
elementFormDefault="qualified"> 
    <xs:complexType name="baseType"> 
        <xs:attributeGroup ref="globalAttributes"/> 
    </xs:complexType> 
    
    <xs:complexType name="myType">
        <xs:complexContent>
            <xs:extension base="baseType">
                <xs:attributeGroup ref="globalAttributes"/>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>
    
    <xs:attributeGroup name="globalAttributes"> 
        <xs:attribute name="id" type="xs:ID"/> 
    </xs:attributeGroup> 
</xs:schema> 
-------------------------------------------------------------------------

> Error not reported on duplicate attributes
> ------------------------------------------
>
>                 Key: XERCESJ-1615
>                 URL: https://issues.apache.org/jira/browse/XERCESJ-1615
>             Project: Xerces2-J
>          Issue Type: Bug
>          Components: XML Schema 1.0 Structures, XML Schema 1.1 Structures
>    Affects Versions: 2.11.0
>            Reporter: Octavian Nadolu
>            Assignee: Mukul Gandhi
>
> If I validate the following schema Xerces does not complain about the the 
> duplicate attribute. The same attribute group is referred twice.
> You can reproduce the issue on the xml-schema-1.1-dev branch.
> -------- schema.xsd --------------------
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"; 
> elementFormDefault="qualified">
>     <xs:complexType name="baseType">
>         <xs:attributeGroup ref="globalAttributes"/>
>         <xs:attributeGroup ref="globalAttributes"/>
>     </xs:complexType>
>     
>     <xs:attributeGroup name="globalAttributes">
>         <xs:attribute name="id" type="xs:ID"/>
>     </xs:attributeGroup>
> </xs:schema>
> -------------------------------------------------------



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