Hi Vincent
You'd have to supply the parameters subject, predicate and object (and in
this case state that the object is a literal).
The parameters will need to be URL-encoded for the REST API.
You don't have to define your own schema, though you should use your own
namespace (and of course it is good practice to define a schema and make it
available).
So in this case you'd use the values:
subject=uri of the object (ie info:fedora/demo:123)
predicate=http://your-relationships-domain/fedoraRels#isFeatured
object=true
isLiteral=true
URL encode the parameters, and pass them in as per the REST API
documentation.
Optionally you could define the datatype of the object (it will default to a
string, but you could for instance use boolean, I see you are using string
in your example).
Note that I have "made up" a namespace for your relationship -
http://your-relationships-domain/fedoraRels#. this is equivalent to
writing, in XML:
.....
<ns:isFeatured
xmlns:ns="http://your-relationships-domain/fedoraRels#";>true</ns:isFeatured>
......
It's entirely up to you what to use as a namespace - but use something that
you "own".
Regards
Steve
-----Original Message-----
From: Nguyen, Vincent (CDC/OD/OADS) (CTR) [mailto:v...@cdc.gov]
Sent: 02 February 2011 14:15
To: Support and info exchange list for Fedora users.
Subject: Re: [fcrepo-user] Modify RDF content
If I were to use the addRelationship method, what would be the parameters
that I pass? I want to modify an existing RELS-EXT datastream to get this
result
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
xmlns:rel="info:fedora/fedora-system:def/relations-external#">
<rdf:Description rdf:about="info:fedora/demo:123">
<rel:isCollection>true</rel:isCollection>
<isFeatured>true</isFeatured>
</rdf:Description>
</rdf:RDF>
Adding a custom relationship description "<isFeatured>true</isFeatured>"
Will I have to write my own relationship schema in order to use the
addRelationship (xmsns:myRel="myRel.xml")?
If not, I think I should be able to use the getDatastreamDissemination
Thanks
Vincent Vu Nguyen
From: Steve Bayliss [mailto:stephen.bayl...@acuityunlimited.net]
Sent: Wednesday, February 02, 2011 2:45 AM
To: 'Support and info exchange list for Fedora users.'
Subject: Re: [fcrepo-user] Modify RDF content
Hi Vincent
There are two methods to update relationships using API-M
The easiest is probably to use the relationships methods - see:
https://wiki.duraspace.org/display/FCR30/API-M#API-M-RelationshipManagement
and the corresponding methods in the REST API at
https://wiki.duraspace.org/display/FCR30/REST+API#RESTAPI-APIMMethods
The second is as you suggest - read the RDF directly (eg API-A
getDatastreamDissemination) , modify it in your application, and then update
RELS-EXT with the updated version (eg the API-M modifyDatastream methods).
Full documentation on the REST and SOAP APIs is at:
SOAP: https://wiki.duraspace.org/display/FCR30/API-A and
https://wiki.duraspace.org/display/FCR30/API-M
REST: https://wiki.duraspace.org/display/FCR30/REST+API
Regards
Steve
-----Original Message-----
From: Nguyen, Vincent (CDC/OD/OADS) (CTR) [mailto:v...@cdc.gov]
Sent: 02 February 2011 06:05
To: fedora-commons-users@lists.sourceforge.net
Subject: [fcrepo-user] Modify RDF content
Hi,
Currently I add a custom node (isFeatured) in the RELS-EXT Datastream to
grab objects I want to feature in my repository. I didn't really know any
other way to do this so I used the RELS-EXT Datastream. I want to modify
RDF Datastream to add this custom node using Fedora APIM. Is there a way to
do this? Or is there a way to read the RDF Datastream as an XML and add a
node and then "re-add" the datastream? Please let me know if there's a
better way to achieve this functionality.
Pardon any ignorant questions I may ask, as I'm still a Newbie.
Vincent Vu Nguyen
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