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PIG  January 2006

PIG January 2006

Subject:

METS sections

From:

"Rebecca S. Guenther" <[log in to unmask]>

Reply-To:

PREMIS Implementors Group Forum <[log in to unmask]>

Date:

Tue, 3 Jan 2006 10:31:19 -0500

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (76 lines)

There are several alternatives to consider in determining which METS
sections should contain the PREMIS metadata using the PREMIS schema(s).

I will assume (for now) that Rights will go in RightsMD whether using
premis:rights or some other rights schema. Although one could argue that
it might be better to include all PREMIS metadata together.

1. Object, Event, and Agent in TechMD. If Agent is related to Rights it
will go into Rights.

2. Object, Event and Agent (if related to events) in DigiProv. If Agent is
related to Rights it will go into Rights.

3. Object in TechMD; Event in DigiProv; Agent with whichever is relevant
(event or rights). 

Looking at a couple of implementations (from information we have primarily
on the wiki), there have been different choices made.

1. Simple METS example with PREMIS (LC):
Uses PREMIS container with object and event in techMD

2. MathArc
Uses object and event in digiProvMD without container. Uses Jhove for some
output of format information in techMD.

3. DSpace
Uses PREMIS container with Object in techMD. Doesn't use digiProv or
PREMIS event.  

4. National Digital Newspaper Program
Uses object in techMD with no container. Uses digiProv for signature
validation information but uses its own schema.

PREMIS container

There may be some advantages to using the PREMIS container. While
considering how to do this here at LC while we were trying to code up a
METS example for a "recorded event", we found that we were inclined to use
the PREMIS container. Advantages are: 
1. Bind the event information with an object identifier. 
2. Simplify the METS encoding so that you only have to assign an ID
attribute to the whole bunch of PREMIS metadata rather than multiple IDs
for separate PREMIS entities. That is, if you have several files making up
your METS object, you will probably need PREMIS technical metadata for
each file. If you don't use the container, you will need a separate techMD
with its own ID attribute for each PREMIS section (object, event, agent).
3. It would be simpler to extract the whole bundle if you wanted to. 
4. If you later wanted to add something, e.g. an agent associated with the
event, you could add within the PREMIS container.

So IF you are using the PREMIS container, according to the schema you must
have an object (and with that object at least an objectIdentifier and
objectCategory). Then it makes sense to choose one METS section to
eliminate redundancy. If you wanted to record events and for the reasons
above thought it useful to use the PREMIS container, you must have at
least an object, so you would have to repeat the object/objectID and
object/objectCategory in both digiProv and techMD if you wanted to divide
up the PREMIS metadata. In which case it seems easier just to bundle all
related to an object in one or the other section.

Please comment. I wonder if we can come up with a best practice.

Rebecca
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^  Rebecca S. Guenther                                   ^^
^^  Senior Networking and Standards Specialist            ^^
^^  Network Development and MARC Standards Office         ^^
^^  1st and Independence Ave. SE                          ^^
^^  Library of Congress                                   ^^
^^  Washington, DC 20540-4402                             ^^
^^  (202) 707-5092 (voice)    (202) 707-0115 (FAX)        ^^
^^  [log in to unmask]                                          ^^
^^                                                        ^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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