Current CMA Documentation Available

Coinciding with the availability of Fedora 3.0 Beta 1 this week, the first round of semi-official CMA (formerly called CMDA) documentation is now available: The Fedora Content Model Architecture. As Dan points out, we'll be doing some name changes before it's all said and done, but so far this is the most up-to-date diagram of the supporting object-object relationships:

As implemented, the BDef and BMech objects are basically unchanged. Here's what the new CModel control object looks like:

The DS-COMPOSITE-MODEL datastream specifies the structural requirements of member objects. The dsCompositeModel.xsd schema describes the expected format. For example, here's the DS-COMPOSITE-MODEL of info:fedora/fedora-system:ContentModel:

<dsCompositeModel xmlns="...">
  <dsTypeModel ID="RELS-EXT">
    <form MIME="text/xml">
  <dsTypeModel>
  <dsTypeModel ID="DC">
    <form MIME="text/xml">
  <dsTypeModel>
  <dsTypeModel ID="DS-COMPOSITE-MODEL">
    <form MIME="text/xml">
  <dsTypeModel>
</dsCompositeModel>

Pretty simple. It says, member objects must have at least these datastreams, and each be in the form specified. If multiple forms are listed in a single dsTypeModel, the datastream may be in any of those forms.