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Re: Defining an XML Fragment in W3C Schema

• To: "Henry S. Thompson" <ht@c...>
• Subject: Re: Defining an XML Fragment in W3C Schema
• From: "Chiusano Joseph" <chiusano_joseph@b...>
• Date: Tue, 11 Mar 2003 07:23:15 -0500
• Cc: xml-dev@l...
• Organization: BAH
• References: <3E6D6179.197309AC@b...> <f5bheaa2q13.fsf@e...>

That's *exactly* what I was looking for. Thanks Henry!

"Henry S. Thompson" wrote:
> 
> "Chiusano Joseph" <chiusano_joseph@b...> writes:
> 
> > I have a need to define an XML fragment in a W3C schema. In other words,
> > an element or attribute in the schema should be able to contain an XML
> > fragment, with the parser recognizing this XML fragment as actual data
> > rather than part of the XML document.
> >
> > I've researched XML Fragments, and I also understand that CDATA was part
> > of the W3C Schema specification at one point but did not make it into
> > the final version.  Can anyone please suggest a way to accomplish this?
> >
> > Much appreciated,
> 
> Not sure I understand, but I'll try.
> 
> You want an element to be constrained to contain a quoted XML
> fragment.  So the following is OK:
> 
> <root>
> <fragmentContainer>
> &lt;?xml version='1.0'?&gt;
> &lt;doc/&gt;
> </fragmentContainer>
> </root>
> 
> But the following is not:
> 
> <root>
> <fragmentContainer>
> &lt;?xml version='1.0'?&gt;
> garbage
> </fragmentContainer>
> </root>
> 
> Is that it?
> 
> In which case, _mirabile dictu_, the best you can do is use a
> NOTATION, along the following lines
> 
> <xs:notation name="XML_10_2e"
>              public="-//W3C//NOTATION XML 1.0//EN"
>              system="http://www.w3.org/TR/2000/REC-xml-20001006"/>
> 
> <xs:element name="fragmentContainer">
>  <xs:complexType>
>   <xs:simpleContent>
>    <xs:extension base="xs:string">
>     <xs:attribute name="fragType" fixed="XML_10_2e">
>      <xs:simpleType>
>       <xs:restriction base="xs:NOTATION">
>        <xs:enumeration value="XML_10_2e"/>
>       </xs:restrition>
>      </xs:simpleType>
>     </xs:attribute>
>    </xs:extension>
>   </xs:simpleContent>
>  </xs:complexType>
> </xs:element>
> 
> Note that because XML Schema works on infosets, not character strings,
> there's now way it could have defined something equivalent to SGML's
> CDATA, even if it had wanted to.  So for direct inclusion of a quoted
> XML fragment, you need to use either &lt; etc. or <![CDATA[ .... ]]>
> _in your instance_.
> 
> XInclude provides a way to include an XML fragment as text.
> 
> Hope this helps.
> 
> ht
> --
>   Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
>                       Half-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]
> 
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url:www.bah.com
org:Booz | Allen | Hamilton;IT Digital Strategies Team
adr:;;8283 Greensboro Drive;McLean;VA;22012;
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email;internet:chiusano_joseph@b...
title:Senior Consultant
fn:Joseph M. Chiusano
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• References:
  • Defining an XML Fragment in W3C Schema
    • From: "Chiusano Joseph" <chiusano_joseph@b...>
  • Re: Defining an XML Fragment in W3C Schema
    • From: ht@c... (Henry S. Thompson)

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