Constraint to/from attribute without type

[Oppmann, Herbert]

Hi,

I need your opinion whether this is conformant to the XML schema specification 
or not (or left to the implementation). Just being curious.

By mistake, I created a schema with a key and keyref where one attribute is of 
type xs:string and the other has no type (i.e. has xs:anySimpleType).

Different parsers return different results:

Altova XMLSpy: ok
Xerces 2.7.0, 2.8.0, 3.0.1, 3.1.0 and 3.1.1: NOT ok
MS XML 4 SP3: ok
MS XML 6: NOT ok
.NET 2.0: ok
Java 1.6u23 org.xml.sax: NOT ok

Here is a small example schema:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";>
        <xs:element name="Main">
                <xs:complexType>
                        <xs:sequence>
                                <xs:element name="FirstPath" type="FirstPathT"/>
                                <xs:element name="SecondPath" 
type="SecondPathT"/>
                        </xs:sequence>
                </xs:complexType>
                <xs:key name="FirstElement_SomeID">
                        <xs:selector xpath=".//FirstElement"/>
                        <xs:field xpath="@SomeID"/>
                </xs:key>
                <xs:keyref name="SecondElement_SomeRef" 
refer="FirstElement_SomeID">
                        <xs:selector xpath=".//SecondElement"/>
                        <xs:field xpath="@SomeRef"/>
                </xs:keyref>
        </xs:element>
        <xs:complexType name="FirstPathT">
                <xs:sequence>
                        <xs:element name="FirstElement" type="FirstElementT" 
maxOccurs="unbounded"/>
                </xs:sequence>
        </xs:complexType>
        <xs:complexType name="SecondPathT">
                <xs:sequence>
                        <xs:element name="SecondElement" type="SecondElementT" 
maxOccurs="unbounded"/>
                </xs:sequence>
        </xs:complexType>
        <xs:complexType name="FirstElementT">
                <xs:attribute name="SomeID" type="xs:string" use="required"/>
        </xs:complexType>
        <xs:complexType name="SecondElementT">
                <xs:attribute name="SomeRef" use="required"/>
        </xs:complexType>
</xs:schema>

And here the instance:

<?xml version="1.0" encoding="UTF-8"?>
<Main xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:noNamespaceSchemaLocation="test.xsd">
        <FirstPath>
                <FirstElement SomeID="153938"/>
        </FirstPath>
        <SecondPath>
                <SecondElement SomeRef="153938"/>
        </SecondPath>
</Main>

FirstElement/@SomeId is of type xs:string and SecondElement/@SomeRef has no 
type, but the result is the same when FirstElement/@SomeId has no type and 
SecondElement/@SomeRef is of type xs:string.

Error at file test.xml, line 9, char 8
  Message: identity constraint key for element 'Main' not found


Thanks in advance.

With best regards,
Herbert Oppmann

Siemens AG
Industry Sector
Industry Automation Division
Industrial Automation Systems
Research & Development
I IA AS R&D DH NBG 3
Gleiwitzer Str. 555
90475 Nuremberg, Germany
Tel.: +49 (911) 895-2657
Fax: +49 (911) 895-152657
mailto:herbert.oppm...@siemens.com

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