NAME

       Tree::XPathEngine::Expr - handles expressions in XPath queries

METHODS

   new
   op_xml
   get_lhs
   set_lhs
   get_rhs
   set_rhs
   push_predicate
   set_op
   get_op
   evaluate
   filter_by_predicate
   as_string
       dump the expression as a string

   as_xml
       dump the expression as xml