NAME

       Tree::XPathEngine::Variable - a variable in a Tree::XPathEngine object

METHODS

       This class does NOT contain 1 instance of a variable, it's in the Tree::XPathEngine class.
       This class simply holds the name of the var, for use by the engine when evaluating the
       query

   new
   xpath_set_value
   xpath_get_value
       synonym of get_value

   evaluate
   as_string
       dump the variable call in the XPath expression as a string

   as_xml
       dump the variable call in the XPath expression as xml