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https://issues.apache.org/jira/browse/XERCESJ-1627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13888887#comment-13888887
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Mukul Gandhi commented on XERCESJ-1627:
---------------------------------------
I'm not sure that issue reported is a bug. But the XSD document described,
looks like a probable use case. I've following thoughts currently about this
issue,
1) I've a feeling that in this example, an <override> element resolves earlier
than <import>. This is correct I think. Due to this, the kind of error
experienced would be seen and is therefore correct.
2) We may model this schema use case, differently probably using a combination
of <redefine>, <assert> etc.
> Invalid error when referring an attribute from another namespace in an
> overridden schema
> ----------------------------------------------------------------------------------------
>
> Key: XERCESJ-1627
> URL: https://issues.apache.org/jira/browse/XERCESJ-1627
> Project: Xerces2-J
> Issue Type: Bug
> Components: XML Schema 1.1 Structures
> Affects Versions: 2.11.0
> Reporter: Octavian Nadolu
>
> If I validate the "override.xsd" schema with Xerces I get an error. It seems
> that it cannot resolve the "attr" attribute that is declared in an imported
> schema.
> I tested on the xml-schema-1.1-dev branch.
> ---- override.xsd------------------
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
> xmlns:imp="importNs" targetNamespace="mainNs">
>
> <xs:import namespace="importNs" schemaLocation="import.xsd"/>
>
> <xs:override schemaLocation="extended.xsd">
> <xs:element name="mainElem">
> <xs:complexType>
> <xs:attribute ref="imp:attr"/>
> </xs:complexType>
> </xs:element>
> </xs:override>
> </xs:schema>
> --------------------------------------
> ----------- extended.xsd ----------------
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"; xmlns:imp="importNs"
> targetNamespace="mainNs">
> <xs:element name="mainElem">
> <xs:complexType>
> <xs:attribute name="myAttr" type="xs:Name"/>
> </xs:complexType>
> </xs:element>
> </xs:schema>
> ---------------------------------------------
> ------- import.xsd-----------------------
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
> targetNamespace="importNs">
> <xs:attribute name="attr" type="xs:string"/>
> </xs:schema>
> --------------------------------------------
> -------- Error-------------------------------------------
> [Error] :-1:-1: src-resolve.4.2: Error resolving component 'imp:attr'. It was
> detected that 'imp:attr' is in namespace 'importNs', but components from this
> namespace are not referenceable from schema document 'null'. If this is the
> incorrect namespace, perhaps the prefix of 'imp:attr' needs to be changed. If
> this is the correct namespace, then an appropriate 'import' tag should be
> added to 'null'.
> ---------------------------------------------------------
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