1  <schema xmlns="http://www.ascc.net/xml/schematron" >
 2       <pattern name="Test count">
 3            <rule context="/*">
 4                 <report test="count(//BBB) = count(//AAA)">O.K.</report>
 5                 <assert test="count(//BBB) &lt;= count(//AAA)">Some AAA are missing</assert>
 6                 <report test="count(//BBB) &lt; count(//AAA)">Some BBB are missing</report>
 7            </rule>
 8       </pattern>
 9  </schema>
10