* Make it possible to define a model check that defines the dependency requirements
  between schemas. i.e. Entity can not be referenced by anyone. Template can reference
  Entity but not Overtimes etc.
* Support constants in relationship_constraints
* Make exceptions into characteristic containers?
* Fix xmi generation: fix existing enumeration/service generation, add message generation
* Add DTOs as a first class elements in DSL (things without an identity that form trees)

* Make it possible to define a model check that defines the dependency requirements
  between schemas. i.e. Entity can not be referenced by anyone. Template can reference
  Entity but not Overtimes etc.
* Support constants in relationship_constraints
* Make exceptions into characteristic containers?
* Fix xmi generation: fix existing enumeration/service generation, add message generation
* Add DTOs as a first class elements in DSL (things without an identity that form trees)
  - http://blog.adamsbros.org/2010/02/07/jaxb-example-code/
  - http://download.oracle.com/javaee/5/tutorial/doc/bnbah.html
  - http://www.vogella.de/articles/JAXB/article.html
Add some notes on DTOs
Add some notes on DTOs
