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PIG  September 2009

PIG September 2009

Subject:

Re: objectCharacteristicsExtension

From:

"Ray Denenberg, Library of Congress" <[log in to unmask]>

Reply-To:

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

Date:

Tue, 1 Sep 2009 10:19:20 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (85 lines)

Robin - First, my apologies for not following up on this sooner.  Your 
"never mind" message let me to think that you had "withdrawn" the issue (so 
to speak), but that was probably a faulty assumption, and Rebecca tells me 
that you are still concerned about this, so let me address it head-on.

I don't think there is necessarily an error either in the dictionary or 
schema.  That is to say, the schema carries the spirit of the dictionary, 
which simply says that there may be multiple extensions.  (If you take 
literally that "objectCharacteristicsExtensions is repeatable" then yes you 
maintain that there is an error, but I think the "spirit" of the dictionary 
is that there may be multiple extensions.)

We decided that if you want several extensions within a given 
<objectCharacteristics> element, you should put them all within a single 
<objectCharacteristicsExtension> element, for example:

<objectCharacteristicsExtension>
    <mix:mix xmlns:"http://whatever">
        <mix:mixelement1></mix:mixelement1>
        <mix:mixelement2></mix:mixelement2>
    </mix:mix>
    <jhove:jhove> xmls:"http://whatever2">
        <jhove:jhoveelement1></jhove:jhoveelement1>
        <jhove:jhoveelement2></jhove:jhoveelement2>
    </jhove:jhove>
</objectCharacteristicsExtension>

This is in contrast to wrapping each extension separately with  an 
<objectCharacteristicsExtension> element, e.g.

<objectCharacteristicsExtension>
    <mix:mix xmlns:"http://whatever">
        <mix:mixelement1></mix:mixelement1>
        <mix:mixelement2></mix:mixelement2>
    </mix:mix>
</objectCharacteristicsExtension>
<objectCharacteristicsExtension>
    <jhove:jhove> xmls:"http://whatever2">
        <jhove:jhoveelement1></jhove:jhoveelement1>
        <jhove:jhoveelement2></jhove:jhoveelement2>
    </jhove:jhove>
</objectCharacteristicsExtension>

And the latter would have been a perfectly legitimate way to do it, but we 
didn't want to allow two different ways (to do exactly the same thing) so we 
chose the first.

However, if the Ed. Board (after seeing this explanation) wants to change 
<objectCharacteristicsExtension>  to repeatable, it can be done very easily 
in the same manner that we corrected an earlier error (no version change) 
and I'll be happy to do it.

--Ray



----- Original Message ----- 
From: "Robin Wendler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, August 05, 2009 2:05 PM
Subject: Re: [PIG] objectCharacteristicsExtension


> Never mind. I see the instruction that one must repeat the 
> objectCharacteristics element to get multiple 
> objectCharacteristicsExtensions. Don't know why, but I see it. Thanks.
>
> At 01:51 PM 8/5/2009 -0400, you wrote:
>>Hi, all -- Unless I'm missing something (always possible), 
>>objectCharacteristicsExtension is listed as repeatable in the PREMIS Data 
>>Dictionary, but it is not repeatable in the 2.0 schema. Can this be easily 
>>fixed and released, or does it have to wait for the next full iteration?
>>
>>Thanks,
>>--Robin
>>
>>
>>Robin Wendler
>>Harvard University Library
>>Office for Information Systems
>>90 Mt. Auburn St.
>>Cambridge, MA 02138 USA
>>617-495-3724 (W)
>>[log in to unmask] 

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