Data models

Data models (schemas) define what fields are available on objects.

Plone has two different major schema subsystems

• zope.schema package used by various form libraries, ZCML and persistent objects
• Archetypes Schema class used with Archetypes content

This paragraph only deals with zope.schema related issues.

• Zope 3 schemas
  • Further reading
  • Schema data definitions
  • Field constructor parameters
  • Schema introspection
  • Field order
  • Default values
  • Persistent objects and schema
  • Collections (and multichoice fields)
  • Dictionaries
• Database
  • Schema based database look-ups
  • Data validation
• Vocabularies
  • Introduction