Issue - 106 - ASSERT activity.

<any-activity>
     <precondition>
	    <expression language="XPath">
	       some-xpath-expression
	    </expression>
     </precondition>
     <postcondition>
	    <expression language="XPath">
	       some-xpath-expression
	    </expression>
     </postcondition>


	....


  </any-activity>