Aha! Thanks Steve, I should have spotted the enumeration's for the
checksum types in the schema.
Cheers,
Simon
From: Steve Bayliss [mailto:stephen.bayl...@acuityunlimited.net]
Sent: 26 January 2011 11:20
To: 'Support and info exchange list for Fedora users.'
Subject: Re: [fcrepo-user] Adding checksum to FOXML datastream
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 || h...@hull.ac.uk ||
www.hull.ac.uk/help
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