[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: is it possible to descrime arbitrary matrix in XML schema
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:assert> </sch:rule> <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. </sch:assert> </sch:rule> These Schematron rules can be embedded within a W3C XML Schema; see: http://www.topologi.com/public/Schtrn_XSD/Paper.html and try using Topologi's Schematron validator: http://www.topologi.com/validator to do the validation. Cheers, Jeni --- Jeni Tennison http://www.jenitennison.com/
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