libxml2-2.7.7/test/schematron/zvon13.sct

<schema xmlns="http://www.ascc.net/xml/schematron" >
     <pattern name="Sum equals 100%.">
          <rule context="Total">
               <assert test="sum(//Percent) = 100">The values do not sum to 100%. </assert>
          </rule>
     </pattern>
</schema>