1<schema xmlns="http://www.ascc.net/xml/schematron" > 2 <pattern name="a child of selected elements"> 3 <rule context="CCC"> 4 <assert test="parent::*[name()='BBB' or name()='DDD']">Element CCC must not be a child of element 5 <name path="parent::*"/> 6 </assert> 7 </rule> 8 </pattern> 9</schema> 10 11