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Hi Deborah,
OAIS structures metadata around a single
entity – the archived content (Content Information). PREMIS structures metadata
around four entities (Objects, Agents, Rights, and Events). The PREMIS Object
entity roughly corresponds to OAIS’s Content Information, but there are
no equivalent OAIS entities for Agents, Rights, or Events. So when we did the
mapping we decided to extend the information types defined in OAIS to each of
the PREMIS entities. So for example, Reference Information is used to identify Content
Information; by extension, Reference Information identifies an Event. Provenance
information records various aspects of the Content Information’s history;
by extension Provenance information records various aspects of an Event’s
history (e.g., when it occurred, what its outcome was, etc.). As you point out,
this approach does not strictly adhere to the OAIS definitions, but we thought
it worked pretty well.
Alternatively, you could retain the OAIS
principle that all metadata is structured around the Object; in this case, you might
say, for example, that all Agent-related metadata is part of an Object’s Context
Information (if you accept the proposition that Agents are part an archived object’s
context). There is some merit in this approach as well.
Anyway, this was the thinking that went
into the mapping. However, it is not set in stone, it was just a way to set the
PREMIS metadata in an OAIS context. Alternative approaches and mappings are
welcome!
Brian
From:
Sent: Tuesday, August 22, 2006
11:51 PM
To: [log in to unmask]
Subject: [PIG] OAIS : PREMIS
mapping question
Dear PIG-list
I've been looking at the OAIS/PREMIS mapping docs on
the swiki and I'm not sure I completely agree with the mapping of the entities
other than Object. Perhaps someone else can explain for me...
The easiest way for me to illustrate is with an example. The
Excel spreadsheet and diagrams in the PowerPoint presentations show a mapping
for the identifier semantic units for the agent, event and
rights entities to OAIS Reference Information. However in the OAIS it
states that Reference Information pertains to "identifiers for the
Content Information."
The identifiers for the entities other than Object are not
identifiers for the Content Information, they are identifiers (pertaining to
PREMIS entities) to reference and structure the metadata about events,
agents and rights in the Context Information and Provenance information
(and perhaps Fixity Information depending on the event type).
Do you see my point or am I off on another planet missing
the real world?
Cheers,
Deb
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Deborah Woodyard-Robinson
Woodyard-Robinson
Holdings Limited
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