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Jeni Tennison wrote:
>
> RELAX NG doesn't require deterministic patterns; the following
> schema should do it:
>
<snip/>
Yes, I got this to work with James Clark's jing
(http://www.thaiopensource.com/relaxng/):
<grammar xmlns="http://relaxng.org/ns/structure/0.9">
<start>
<element name="game">
<element name="white">
<ref name="move"/>
</element>
<zeroOrMore>
<element name="black">
<ref name="move"/>
</element>
<element name="white">
<ref name="move"/>
</element>
</zeroOrMore>
<optional>
<element name="black">
<ref name="move"/>
</element>
</optional>
</element>
</start>
<define name="move">
<text/>
</define>
</grammar>
The grammar expanded a bit because you can't simply say <element
name="white/>, you have to put in some kind of content description, even
if only <text/> or <empty/>, so I created a common type, move.
> XML Schema forces deterministic model groups, so you can't use that.
>
Interesting.
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified">
<xs:element name="game">
<xs:complexType>
<xs:sequence>
<xs:element ref="white"/>
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element ref="black"/>
<xs:element ref="white"/>
</xs:sequence>
<xs:element ref="black" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="black">
<xs:complexType/>
</xs:element>
<xs:element name="white">
<xs:complexType/>
</xs:element>
</xs:schema>
is an XML Schema equivalent.
XSV and MSXML4 detect the ambiguous content model, XML Spy 4 beta 1
ignores it and validates correctly.
Francis.
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