HttpScriptContext is a subinteface of ScriptContext which is used
to connect a ScriptEngine and implicit objects form a servlet
container to for a single request.
Retrieves a boolean value which indicates whether the
HttpSession associated with the current request is exposed in
SESSION_SCOPE attribute and in the HttpScriptRequest.
Utility for converting between Java representations of XML such DOM nodes,
StAX streams, or Axiom OMElements, into script language representations such
as JavaScript E4X, Ruby ReXML, or Python ElementTree.