- write some docs for these new interfaces



-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

- finish IOMemory backend

- make plugin a class

- add description of all serializers

- add test cases to run through all serializers

- need a test for a graph that's not serializable
  - raise Error("This graph cannot be serialized in RDF/XML. Could not split predicate: '%s'" % predicate)

- need test for Graph.value

- need test for Literal.__eq__ re: datatype

- clean up arguments parse method takes 
  (eg. a string containing value to be parsed) sniff?

- include rdflib's DOAP as example?