Multiple XMP Packets. Why?

I've read the XMP specification and I did'nt understand why it's possible to have more than one XMP packet in a file.
I can't find any reason for that. I think it's not clear for a person to understand what is the "main" XMP packet taking a look inside a PDF file for example.
Why incremental saving don't write only one XMP packet uploading it?
Anyone knows the reason for that choice?
Davide Noaro.

Multiple XMP packets within a file have a tremendous value for enterprise customers. We offer an XMP-centric digital asset management system (MediaBeacon) that catalogs any file type and stores all data in XMP. XMP is then mirrored into an SQL database and we maintain the link between the two.
Multiple XMP packets within a file give our customers an opportunity to have separate metadata blocks for each department, for instance. We are able to specify which blocks are viewable and editable by a given user or group of users. So, each file can have any number of namespace aware (unlike XML) metadata fields or metadata blocks that are unique across the universe.
Using Pound Hill's software you can customize the way each tab looks.
Here's what these XMP blocks look like to the end user. They are all collapsible - below you can see only "XMP Basic" tab open.
http://forum.brightech.com/btimages/schemas.gif

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When scanning a PDF (in my case) using the XMPScanner from
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this can be solved with a 'SaveAs' which gather all xmp
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Is there anyway to get the XMPScanner to render all packages as valid ?
a flag, option or anything ?
Anyone out there that have had the same problem, and solved it ?
Thanks in Advanced

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Hi,
I opened a file Bluesquare.indd(from XMP SDK sampke) and I found two XMP packets inside the file.
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and another one with tag
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My feeling here is that simply changing join syntax and case vs decode issues is not going to give any significant improvement in performance, and as Tubby points out, there is not a lot to go on. I think you are going to have to investigate things along the line of parallel query and index vs full table scans as well any number of performance tuning methods before you will see any significant gains. I would start with the Performance Manual as a start and then follow that up with the hard yards of query plans and stats.
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The data I would like include is basic XML format:
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Hi,
almost right..
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FIXED....
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[email protected]

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You may want to repost this in the XMP SDK forum: http://forums.adobe.com/community/design_development/xmp_sdk

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Multiple XMP Packets. Why?

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