Hi Simon
The checksum type is in the schema as a <contentDigest> element within
<datastreamVersion> - see xsd:complexType name="contentDigestType".
If you are adding/updating datastreams I believe the relevant API methods
allow you to specify the relevant parameters for checksums (as opposed to
ingesting a complete FOXML object).
Regards
Steve
-----Original Message-----
From: Simon W Lamb [mailto:s.l...@hull.ac.uk]
Sent: 26 January 2011 10:41
To: fedora-commons-users@lists.sourceforge.net
Subject: [fcrepo-user] Adding checksum to FOXML datastream
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 || <mailto:h...@hull.ac.uk>
h...@hull.ac.uk || <http://www.hull.ac.uk/help> www.hull.ac.uk/help
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