code: public boolean bool(XPathContext xctxt)
            throws javax.xml.transform.TransformerException
    {
      return (asNode(xctxt) != DTM.NULL);
    }
docs: Evaluate this operation directly to a boolean.
  
  @param xctxt The runtime execution context.
  
  @return The result of the operation as a boolean.
  
  @throws javax.xml.transform.TransformerException