1 <schema xmlns="http://www.ascc.net/xml/schematron" >
2 <pattern name="Attributes present">
4 <assert test="not(@aaa) or (@aaa and @bbb)">The element must not have an isolated aaa attribute</assert>
5 <assert test="not(@bbb) or (@aaa and @bbb)">The element must not have an isolated bbb attribute</assert>