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Is-a (was-a Re: [xml-dev] Victory has been declared in the schema wars ...)
- From: "Rick Jelliffe" <rjelliffe@allette.com.au>
- To: xml-dev@lists.xml.org
- Date: Mon, 4 Dec 2006 13:42:05 +1100 (EST)
Richard Salz said:
>> <pattern is-a="RequiredChild">
>
> Why 'is-a'? Why not something already common, like id or name? Then I
> could easily expect to use the fragment notation to fetch a pattern, or
> reference it within a namespace URI.
The pattern can have a name attribute to give it an id. I left them out of
the examples for clarity.
The is-a attribute connects the pattern to an abstract pattern declaration
with the same name. So in the example above there would be something like
<pattern name="RequiredChild" abstract="true">
<rule context=" $parent ">
<assert test=" count( $child ) >= 1 ">
In a <name/> element, the element <name select=" $child "/> is
required.
</assert>
</rule>
</pattern>
Cheers
Rick Jelliffe
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