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Re: Re: Language Theorie concerning XML Schema (heavy, at leas

• To: Bob Foster <bob@o...>
• Subject: Re: Re: Language Theorie concerning XML Schema (heavy, at least to me)
• From: Gregor <iamgregor@g...>
• Date: Thu, 28 Apr 2005 21:35:12 +0530
• Cc: "Henry S. Thompson" <ht@i...>, xml-dev@l...
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• In-reply-to: <4270FECE.7050709@o...>
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• Reply-to: Gregor <iamgregor@g...>

Hi Bob,

Thanks for checking the example below.

I am afraid it was just used by ht to show some concept that I was
pondering and need not actually run to prove the point (it does
though, simply remove the type declaration in the elements x, y, z)

I moved the ensuing discussion to xmlschema-dev@w... by suggestion of ht.

Kind Regards,

Gregor

2005/4/28, Bob Foster <bob@o...>:
> Hmm. XercesJ reports three errors (not warnings) from this schema of the
> form:
> 
> Error - src-resolve: Cannot resolve the name 'unknownX' to a(n) 'type
> definition' component.
> 
> Where X is one of: 1, 2, 3;
> 
> Bob Foster
> 
> Henry S. Thompson wrote:
>  > I'll answer a simple question which I understand, and which I _think_
>  > is what you're asking.
>  >
>  > The following XML document is valid:
>  >
>  > <!DOCTYPE root [
>  > <!ELEMENT root (a|x)>
>  > <!ELEMENT a (b|y)>
>  > <!ELEMENT b (c|z)>
>  > <!ELEMENT c EMPTY>
>  > ]>
>  > <root><a><b><c/></b></a></root>
>  >
>  > Note it contains no declarations for the elements x, y and z.
>  >
>  > The corresponding schema document successfully validates the same
>  > instance:
>  >
>  > <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
>  >  <xs:element name="root">
>  >   <xs:complexType>
>  >    <xs:choice>
>  >     <xs:element ref="a"/>
>  >     <xs:element ref="x"/>
>  >    </xs:choice>
>  >   </xs:complexType>
>  >  </xs:element>
>  >
>  >  <xs:element name="a">
>  >   <xs:complexType>
>  >    <xs:choice>
>  >     <xs:element ref="b"/>
>  >     <xs:element ref="y"/>
>  >    </xs:choice>
>  >   </xs:complexType>
>  >  </xs:element>
>  >
>  >  <xs:element name="b">
>  >   <xs:complexType>
>  >    <xs:choice>
>  >     <xs:element ref="c"/>
>  >     <xs:element ref="z"/>
>  >    </xs:choice>
>  >   </xs:complexType>
>  >  </xs:element>
>  >
>  >  <xs:element name="c">
>  >   <xs:complexType/>
>  >  </xs:element>
>  >
>  >  <xs:element name="x" type="unknown1"/>
>  >  <xs:element name="y" type="unknown2"/>
>  >  <xs:element name="z" type="unknown3"/>
>  > </xs:schema>
>  >
>  > So yes, you can do incremental development of a schema for a complex
>  > XML language.
>  >
>  > ht
> 
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• Follow-Ups:
  • Re: Re: Language Theorie concerning XML Schema (heavy, at least to me)
    • From: "Rick Jelliffe" <ricko@a...>
  • Re: Re: Language Theorie concerning XML Schema (heavy, at least to me)
    • From: "Rick Jelliffe" <ricko@a...>

• References:
  • XSD spec question
    • From: Chris Griffin <cgriffin@h...>
  • Re: XSD spec question
    • From: Eric van der Vlist <vdv@d...>
  • Re: XSD spec question
    • From: Razvan MIHAIU <mihaiu@m...>
  • Re: XSD spec question
    • From: Gregor <iamgregor@g...>
  • Re: XSD spec question
    • From: Rick Jelliffe <ricko@a...>
  • Language Theorie concerning XML Schema (heavy, at least to me)
    • From: Gregor <iamgregor@g...>
  • Re: Language Theorie concerning XML Schema (heavy, at least to me)
    • From: ht@i... (Henry S. Thompson)
  • Re: Re: Language Theorie concerning XML Schema (heavy,at least to me)
    • From: Bob Foster <bob@o...>

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