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Title (goal)
Repository generated/mediated derivatives
Primary Actor repository manager
Scope 
Level 
Story

 A user requests the download of some material from the repository.  Based on the metadata for that object, the characteristics of the requesting user the derivative provided to the user contains extra information (context, rights restrictions, etc.).  This attachment of functionality to an object in fedora must be integrated into fedora such that:

  1.  access controls at the repository level are in effect
  2. changes to this behavior can be accomplished centrally
Title (goal)

Anchor
rdf
rdf

Title (goal)
live querying of object graph
Primary Actor script or program acting against the repository
Story

 Ingest and update routines often have to determine where in the graph of relationships to place a new (or updated) object, in doing so, querying a synchronously updated index of the relationships is necessary.  For example:

  1. find all children of an object when the relationship information is only stored on the children
  2. insert a new object within a chain of linked nodes
  3. perform the above operation with some concept of locking such that concurrent operations may insert objects into the same chain
CommentsIn previous versions of fedora, having the resource index synchronized caused a huge performance hit, but if updates weren't synchronized, the most common use cases would fail in unpredictable ways.  One query might not pick up recent changes, then the next one would, even with only a single process running against fedora.

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