xml-dev - Re: Mixed contents and group in schema definition

[ht@cogsci.ed.ac.uk (Henry S. Thompson)]

Pierre Attar <patt@tireme.fr> writes:

> Hi,
> 
> I'm trying to understand Schema and I would like to use groups for defining
> shared mixed contents.
> For maintenance purpose, I prefer to use the group mechanism, in order to have
> :
> 
> 
>          <xsd:group name="textContent">
>                  <xsd:choice minOccurs="0" maxOccurs="unbounded">
>                          <xsd:element name="B" type="textType"/>
>                          <xsd:element name="I" type="textType"/>
>                          <xsd:element name="CMD" type="textType"/>
>                          <xsd:element name="CAP" type="textType"/>
>                  </xsd:choice>
>          </xsd:group>
> 
> and
> 
>          <xsd:complexType name="textType" content="mixed">
>                  <xsd:group ref="textContent"/>
>          </xsd:complexType>
> 

Your basic approach is correct, but the above is slightly broken --
you need the occurrence indicators on the group _reference_:

         <xsd:group name="textContent">
                 <xsd:choice>
                         <xsd:element name="B" type="textType"/>
                         <xsd:element name="I" type="textType"/>
                         <xsd:element name="CMD" type="textType"/>
                         <xsd:element name="CAP" type="textType"/>
                 </xsd:choice>
         </xsd:group>

         <xsd:complexType name="textType" content="mixed">
            <xsd:group ref="textContent" minOccurs="0" maxOccurs="unbounded"/>
         </xsd:complexType>

With this change XSV [1] validates the following instance:

<AUTHOR>
<FIRST>Here is a <B>real</B> test </FIRST>
<LAST/>
</AUTHOR>

just fine.

ht

[1] http://www.w3.org/2000/06/webdata/xsv
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, 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@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/

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