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Within the Fedora 4 model a Datastream comprises a binary and a NonRdfSourceDescription. Treat both together as a datastream, and ; they only ever occur in a pair.
Dissemination
An approach previously available in Fedora 3 that allowed for binding a service from outside the repository to a content model or type for content. Note: disseminators, as such , do not exist in Fedora 4 itself, but the API-X effort will provide similar functionality by extending the core with specifications and optional machinery.
Federation (aka Projection)
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