[Zope3-dev] Proposal: Vocabulary Fields

[Fred L. Drake, Jr.]

I've posted a new proposal in the Zope 3 wiki:

        http://dev.zope.org/Zope3/VocabularyFields

>From the proposal:

  Zope schema provide support for an "Enumerated" flavor of many basic
  types.  The Enumerated fields provide a way to specify a field which
  may have any value or, more interestingly, one from a list of
  possible values hard-coded in the schema.

  Vocabulary fields provide a conceptually similar field type for
  situations in which the set of options may be highly dynamic or
  otherwise by decoupled from the schema definition itself.  A
  vocabulary may be provided by some object in the ZODB, a query to an
  external database, the contents of a file maintained by another
  process, or static data provided by a separately maintained piece of
  code.

  A vocabulary field in a schema contains either a vocabulary object
  (IAbstractVocabulary) or a name of a vocabulary.  If a name is used,
  the specific vocabulary to use will be supplied by a registry when
  the schema field is bound to an instance of a content object.


  -Fred

-- 
Fred L. Drake, Jr.  <fdrake at acm.org>
PythonLabs at Zope Corporation