<CODE>evaluate(Object item, QName returnType)</CODE></A>
 with a <code>returnType</code> of
 <A HREF="../../../../javax/xml/xpath/XPathConstants.html#STRING"><CODE>XPathConstants.STRING</CODE></A>.</p>

 <p>See "Evaluation of XPath Expressions" section of JAXP 1.3 spec
  for context item evaluation,
 variable, function and QName resolution and return type conversion.</p>

 <p>If a <code>null</code> value is provided for
 <code>item</code>, an empty document will be used for the
 context.<DD><DL>
<DT><B>Spec