Schematron is an actively used xml format created in 1999. Schematron is a rule-based validation language for making assertions about the presence or absence of patterns in XML trees. It is a structural schema language expressed in XML using a small number of elements and XPath. In a typical implementation, the Schematron schema XML is processed into normal XSLT code for deployment anywhere that XSLT can be used. Read more on Wikipedia...

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Example code from the web:

<schema xmlns="">
     <title>Date rules</title>
     <rule context="Contract">
        <assert test="ContractDate &lt; current-date()">ContractDate should be
in the past because future contracts are not allowed.</assert>

Last updated August 9th, 2020

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