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   Re: [xml-dev] is it possible to descrime arbitrary matrix in XML schema

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Hi Valeri,

> how matrix like example below can be discribed in XML schema in such
> way that actual number of rows and columns in XML file could be
> checked during the validation against this schema?

The only kinds of schema languages that will enable you to check this
kind of complex co-occurrence constraint are those that use
"rule-based validation" such as Schematron. W3C XML Schema (which is
what I guess you mean by XML schema) doesn't support these kinds of
constraints. In Schematron, you could do:

<sch:rule context="Matrix">
  <sch:assert test="Description/rows = count(row)">
    The number of rows in the Matrix must be the same as the value of
    the 'rows' element within the Description.

<sch:rule context="row">
  <sch:assert test="../Description/columns = count(cell)">
    The number of cells in the row must be the same as the value of
    the 'columns' element within the Description of the Matrix.

These Schematron rules can be embedded within a W3C XML Schema; see:


and try using Topologi's Schematron validator:


to do the validation.



Jeni Tennison


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