- implement counted transitions at the automata level- Unicode:  + upgrade to 3.2  + improve the python script to generate better test    expressions to check the list of ranges.- Implement the interface at the SAX level- Implement the missing parts in the Structure part   + all content model   + enumerations   + countless others c.f. the TODO scattered in the code- Complete the Built-In datatype collections and Facets implementations- Regression tests based on  + the primer:    http://www.w3.org/TR/xmlschema-0/  + the Schemas Test Collection:    http://www.w3.org/2001/05/xmlschema-test-collection/  + archives of the schemas-dev list- Integrity constraints:  + what's that ? How need to read about it- "formal" checking, i.e. go through the full Structure spec and  bind code and associated parts of the Schemas spec- go though the erratas  http://www.w3.org/2001/05/xmlschema-errata