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Enhanced Content Models add several new features to the CMA of Fedora.
1. Ability to specify an ontology for the object relations
2. Ability to specify ontologies for the datastream relations
3. Ability to specify schemas for the datastreams
4. Ability to specify optional datastreams
The ability to clone an object will probably be added to Fedora, but it is not a direct part of ECM.
Ontology for Object Relations
As detailed, there will be an ONTOLOGY datastream in the content model, with the ontology for relations having the data object as subject
Ontologies for Datastream Relations
The DS-COMPOSITE-MODEL will be extended with the <extension> tag, as detailed above. For each datastream, it will be possible to specify an ontology for the relations having this datastream as subject
Schemas for Datastreams
The DS-COMPOSITE-MODEL will be extended with the <extension> tag, as detailed above. For each datastream, it will be possible to specify another datastream containing the schema.
Ability to specify optional datastreams
The DS-COMPOSITE-MODEL will get support for the Optional attribute on the datastream definitions.
Validator
A validate method that will validate a data object against the constrains specified in it's content models.
This is in fact covered by the JIRA issue http://fedora-commons.org/jira/browse/FCREPO-685