Content Object Repository Discovery and Registration Architecture (CORDRA)
is an open, standards-based model for how to design and implement software systems
for the purposes of discovery, sharing and reuse of learning content through the
establishment of interoperable federations of learning content repositories.
Designed to be an enabling model to bridge the worlds of learning content management
and delivery, and content repositories and digital libraries, CORDRA aims to identify
and specify (not develop) appropriate technologies and existing interoperability
standards that can be combined into a reference model used to enable a learning
content infrastructure.
CORDRA is:
- A formal model that can be used
to design federations of repositories (the CORDRA reference model)
- A collection of operational
systems built from the CORDRA model, including:
- A prototype implementation of
a repository federation
- An operational federation
of federations used to combine different CORDRA federations.
- The activities and projects
surrounding the definition of the CORDRA model and creation of the operational systems.
CORDRA is not a repository of content. It is a searchable index of content metadata
that can be resolved to content located in distributed repositories.
CORDRA does not define or dictate how a repository operates, nor does it affect
local policies. It only defines how to make deposits in the registry.
>> CORDRA and the ADL Registry
ADL Registry
DoD is funding the development and deployment of an instance of CORDRA (through
the Defense Technical Information Center [DTIC]) as a service
to
DoD Components called the
ADL Registry. This provides a useful infrastructure that
DoD components may build upon.
The ADL Registry is not a repository of content, but that of a searchable index
of content metadata that can be resolved to content located in distributed repositories.
Initially the ADL Registry will be simple and services will be added as policy issues
are addressed. Anyone will be allowed to search the ADL Registry through
a portal*.
For the first time the ADL Registry will allow search, discovery, identification,
resolution and retrieval of content. This should enable "just in time" delivery
of content over time.
*Note: The searching may or may not permit access
or retrieval; results will resolve to a means of retrieval that may require local
access privileges or authentication. ADL is initially silent on access and
security issues until requirements are developed by DoD components. It is
hoped that a working group with representatives from key DoD Components will be
convened to address these issues and questions.
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