XML format
----------
- Document the format
- Write a scanner to create XML from annotated headers
- Add attributes to connect signals to their default handlers
  and wrappers to their vfuncs
- Add attributes for struct offsets

Binary format
-------------
- Add hashes to lookup interfaces and functions in interfaces
- Write a validator
- Handle parent being 0

Compiler
--------
- Cleanup, maybe turn the nodes in to objects to avoid the horrific 
  type switches
- Add thorough error checking

Repository
----------
- Reconsider the current clunky API, maybe an iterator approach is better
- Add thorough error checking
- Use hashes 
- Maybe allow populating repositories at runtime
- Think about a system-wide repository mapping namespace ids to 
  libraries/metadata files

General
-------
- More tests
- Check how the format scales to something the size of GTK+