- *more* input checking
  - use of reserved names
  - duplicate names
  - needed attributes given 
  - ...
  - ...
  - ...
- config.m4 support for
  - header checks
  - ...
- class implementation and documentation support
- protos
  - object type specification (as in resources)
	- default values (supported by DocBook?)
  - code generation for 'pass by refecence'
  - ? option for 'old style' parameter parsing code generation ?
    (less readable but faster and more flexible)?
- more licenses
  - GPL (with exception to allow linking against PHP)
  - QPL
  - MPL?
  - Artistic
  - ...
  - dual/multiple licensing?
- full support for stream wrappers and filters
- DTD support for creating custom tests