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Re: W3C Schema substitution-group question

• To: David Byrden <David@B...>
• Subject: Re: W3C Schema substitution-group question
• From: ht@c... (Henry S. Thompson)
• Date: 16 Dec 2002 10:32:01 +0000
• Cc: xml-dev@l...
• In-reply-to: <5.1.1.6.0.20021215124749.037bd1c0@m...>
• References: <5.1.1.6.0.20021215124749.037bd1c0@m...>
• Sender: ht@i...
• User-agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Military Intelligence)

David Byrden <David@B...> writes:

> I'm using a substitution group of 2 element types. The head element
> and the alternative element are in different namespaces.
> 
> In my XML document, I'm instantiating the alternative element
> where the schema mandates the head should go. If I import the
> 2nd namespace in the schema, everything works.

Which schema?  Here's what I understand you to be describing:

s1.xsd:
<xs:schema targetNamespace="urn:s:1" xmlns:s1="urn:s:1">
 <xs:complexType name="rootType">
  <xs:sequence>
   . . .
   <xs:element ref="s1:head"/>
   . . .
  </xs:sequence>
 </xs:complexType>

 <xs:element name="head">...</xs:element>
</xs:schema>

s2.xsd:
<xs:schema targetNamespace="urn:s:2" xmlns:s1="urn:s:1">
 <xs:import namespace="urn:s:1"/>
 <xs:element name="alt" substitutionGroup="s1:head">...</xs:element>
</xs:schema>


instance:

<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:s1="urn:s:1" xmlns:s2="urn:s:2"
      xsi:schemaLocation="urn:s:1 s1.xsd urn:s:2 s2.xsd"
      xsi:type="s1:rootType">
  <s2:alt>...</s2:alt>
</root>

> But why should I import the 2nd namespace in the schema
> if nothing in the schema refers to it? I want the dependencies to
> be one-way. I'd prefer to get this 2nd namespace with the
> schemaLocation attribute in the document, because the
> document DOES depend on it.

I'm not sure I'm answering your question, but the above is the minimum
necessary, and is schema-valid.

> But when I try to do so, the processor does not even read my
> 2nd namespace's schema as specified in schemaLocation. It
> reads the original schema and tells me I have invalid content.

> It seems as if the processor wants all schemas referenced
> by schemaLocation to be complete in and of themselves, ignoring
> possible inheritance across them. Maybe this is the correct behaviour,
> but I don't know.
> 
> I'm using Java and JWSDP1.0_01

What processor is that?  Please unpack the acronym.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2002, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@c...
		     URL: http://www.ltg.ed.ac.uk/~ht/
 [mail really from me _always_ has this .sig -- mail without it is forged spam]

• References:
  • W3C Schema substitution-group question
    • From: David Byrden <David@B...>

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