- In the MML API, can Type_Any be a Type_Code?
* Currently the parser assumes that it can.
- Since there can be a Rule_None in the Inheritance_Rule, do we need to
add this to the syntax of MRL?
* I will need to add this feature to the parser.
- Since attributes can have types over those possible in Type_Code, can they
have a Type_None? How is this done in the MRL syntax? I thought it was
syntactically incorrect to give an attribute without a ": type" clause.
* Currently the parser won't let you express a Type_None.
- How do we encode hooks in the API? Has the API been extended for hooks?
* ???