Thanks for the example Asger. Just for interest, I used the following:-
<foxml:datastream STATE="A" CONTROL_GROUP="M" VERSIONABLE="true" ID="content">
<foxml:datastreamVersion ID="content.0" LABEL="content"
MIMETYPE="application/pdf">
<foxml:contentDigest TYPE="MD5"/>
....
</foxml:datastreamVersion>
</foxml:datastream>
Without the 'digest' specified, and Fedora auto computed the checksum. But I do
understand the extra advantages of adding your own DIGEST attribute pre-ingest.
Thanks again,
Simon
-----Original Message-----
From: Asger Askov Blekinge [mailto:a...@statsbiblioteket.dk]
Sent: 26 January 2011 11:34
To: Support and info exchange list for Fedora users.
Subject: Re: [fcrepo-user] Adding checksum to FOXML datastream
The correct way is to write
<foxml:datastream STATE="A" CONTROL_GROUP="M" VERSIONABLE="true"
ID="content">
<foxml:datastreamVersion ID="content.0" LABEL="content"
MIMETYPE="application/pdf">
<foxml:contentDigest TYPE="MD5" DIGEST="chkjshfkjsdk"/>
...
</foxml:datastreamVersion>
</foxml:datastream>
Hope this helps
On Wed, 2011-01-26 at 11:41 +0100, Simon W Lamb wrote:
> Hi,
>
>
>
> I’m in the process of building a set of Fedora objects using FOXML. I
> have left the fedora.fcfg autoChecksum configuration set to False for
> performance reasons, however I would like to specify checksums on
> specific Datastreams. The Checksum documentation at
> https://wiki.duraspace.org/display/FCR30/Checksums hints that it
> should be possible to add checksum information at a Datastream level:-
>
>
>
> “Another way to override the default checksumming mechanism is via new
> attributes that have been added to the FOXML and METS specs for
> ingesting digital objects. The FOXML and METS specifications now allow
> the checksum algorithm to be used for each Datastream to be specified
> as attributes on one of the elements defining that Datastream. When a
> checksum algorithm is specified in the XML for a Datastream of a
> digital object, this value will be used to compute the checksum for
> that Datastream rather than the default algorithm specified in the
> fedora.fcfg file. Note that the syntax for thusly specifying a
> checksum algorithm for a Datastream in a digital object is different
> for FOXML and for METS, the specific syntax to use can be found in the
> schemas for those XML formats.”
>
>
>
> Therefore I have a built a FOXML with the following:-
>
>
>
> <foxml:datastream STATE="A" CONTROL_GROUP="M" VERSIONABLE="true"
> CHECKSUM="MD5" ID="content">
>
> <foxml:datastreamVersion ID="content.0" LABEL="content"
> MIMETYPE="application/pdf"> ...
>
> </foxml:datastreamVersion>
>
> </foxml:datastream>
>
>
>
> Unfortunately this fails the schema validation (checksum not a valid
> attribute). Sure enough there is no mention of checksum at
> http://www.fedora.info/definitions/1/0/foxml1-1.xsd
>
>
>
> What is the correct way of specifying a checksum for datastream within
> FOXML?
>
>
>
> Many thanks,
>
> Simon Lamb
> Software Developer
> Information and Communication Technology Department (ICTD) || The
> University of Hull
> T. +44 (0) 1482 462076
> s.l...@hull.ac.uk|| www.hull.ac.uk
>
> Customer Support. +44 (0) 1482 462010 || h...@hull.ac.uk ||
> www.hull.ac.uk/help
>
>
>
>
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