xml-dev - Re: Which elements can be root elements?

[Rick JELLIFFE <ricko@geotempo.com>]

(Cut and paste answer)

You can use the Schematron open source schema language, which is
specifically aimed for the 1001 non-regular constraints that real data
requires.

Off the top of my head, the appropriate schema would look something like
this:

<sch:schema  xmlns:sch="http://www.ascc.net/xml/schematron">
<pattern>
 <rule context="/*">
    <assert test="/X">The document should start with an X
element.</assert>
 </rule>
</pattern>


Schematron home page at
http://www.ascc.net/xml/resource/schematron/schematron.html


Rick Jelliffe

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