This list is quite likely incomplete.

* General
  - more work on complex and simple handlers... clean up complex like with 
    attributes
  - fix ID and IDREFS
  - complete + document Scope + Scoped
  - proper namespace validation in Wildcard
  - model groups
  - complete and document all simple types (that can be, document those that 
    can't)
  - complete and document all facets, including cross-facet validation
  - complete and document complex types
  - cleanup/dispose code to break circular references

* Type::Simple
  - add FACET_ORIGIN to Type::Simple, just need to add facets() method to 
    return user defined facets

* XML::Schema::Base
  - debug method(s)
  - dump_hash(), etc.
  - option to automatically throw exceptions

* XML::Schema::Type::Simple/Builtin
  - move init(), instance(), validate(), etc., into Type base class
  - fixed init() to determine facets.
  - maybe have 2 kinds of facets:- pre-determined ones (that can't be revoked)
    and user-defined ones (which can).
  - note that this is different from fundamental facets which should be very
    built-in.  Need to fix init() to determine these (from package vars?)
    or via general purpose profile() method?...
  - ...or should there be class methods fundamentals(), facets(), actions() etc?
    These could double up as class methods (return class definitions) or object
    methods (return object values).
  - how to derive builtin list types from base and list?

* XML::Schema::Facet
  - support for binary data in length (already there?)
  - facets fixed in a base type should prevent derived types from setting 
    any other value
  - other schema constraints: minInlusive <= maxInclusive, etc.
  - minInclusive, etc., as applying to time/date
  - max/min comparison of dates and other non trivial types
  - enumeration facets must compliment each other (hey, nice tie! :-)
    e.g.
    <restriction>
      <enumeration value="AK"/>
      <enumeration value="AL"/>
      <enumeration value="AR"/>
      <!-- etc -->
    </restriction>

* XML::Schema::Test
  - don't export subs by default