Sample Schematron

<?xml version="1.0" encoding="UTF-8"?><sch:schema xmlns:sch="http://www.ascc.net/xml/schematron"><sch:ns prefix="hl7v3" uri="urn:hl7-org:v3"/><sch:pattern name="Check structure"><sch:rule context="hl7v3:PRPA_IN403001UV01"><sch:assert test="count(hl7v3:profileId) = 1">The profileId should be present. It is missing.</sch:assert></sch:rule></sch:pattern></sch:schema>

This schematron checks for the presence of the <profileId> tag under PRPA_IN403001UV01 tag.