I use the REGEX function in SPARQL through Fedora's RI search service
successfully. It won't work, though, if the value is an IRI and not a
literal -- but I'm a fairly novice SPARQLer myself, so others can
correct or confirm that.
scott
On 11/11/2011 08:40 AM, Benjamin Armintor wrote:
> You might also try using the REGEX function in a SPARQL query. I'm
> not sure if Fedora will pass it along to Mulgara or not, but it's
> worth a shot.
>
> On Fri, Nov 11, 2011 at 8:32 AM,<aj...@virginia.edu> wrote:
>> It sounds a bit like you're using the RI (an RDF index) to do something
>> (string-matching) at which a full-text index (like Lucene or Zebra) would be
>> better.
>>
>> If you want to use RDF for this problem, I suggest that you create objects
>> to represent those upper entities you named (building, collection, section,
>> etc) and make a graph, e.g.
>>
>> objects:myobject1 isMemberOf sections:UkDhU.DCD.Misc.Ch
>> objects:myobject2 isMemberOf sections:UkDhU.DCD.Misc.Ch
>> sections:UkDhU.DCD.Misc.Ch isPartOf collections:UkDhU.DCD
>> collections:UkDhU.DCD isInside buildings:UkDhU
>>
>> or using some other suitable RDF predicates. Then your query will not rely
>> on string-matching, at which RDF stores are not especially good, but on
>> structure matching, at which RDF stores are very good. In my example a query
>> to find the object in a building might look something like:
>>
>> SELECT
>> ?object isInside ?building
>> WHERE {
>> ?object isMemberOf ?section.
>> ?section isPartOf ?collection.
>> ?collection isInside ?building.
>> }
>>
>> or to find how many objects from a collection have been Fedora-ized, you
>> could use a count query on:
>>
>> SELECT
>> ?object
>> WHERE {
>> ?object isMemberOf ?section.
>> ?section isPartOf ?collection.
>> }
>>
>> and so forth.
>>
>>
>> ---
>> A. Soroka
>> Online Library Environment
>> the University of Virginia Library
>>
>>
>>
>>
>> On Nov 11, 2011, at 7:50 AM, HIGGINS R.I. wrote:
>>
>>> Hello:
>>> I am attempting to keep track of which of our real objects have digital
>>> versions stored in Fedora. The simplest way to do this seemed to be to
>>> add an entry to the RELS-EXT datastream along the lines of
>>>
>>> <hasLocalReferenceNumber
>>> xmlns="info:fedora/fedora-system:def/relations-external#"
>>> rdf:resource="UkDhU:DCD.Misc.Ch.3650"></hasLocalReferenceNumber>
>>>
>>> For this to be useful, it would be necessary to be able to different
>>> searches:
>>> find all starting UkDhU:* (everything in the building)
>>> find all starting UkDhU:DCD* (everything in the collection)
>>> find all starting UkDhU:DCD.Misc.Ch.* (everything in the section of the
>>> collection)
>>> and so forth - assuming * to be a wild card.
>>>
>>> The lack of information on wild card searching of RDF out there implies
>>> that this is not a feature that is available. Is there a way to do this,
>>> or is it back to the drawing board ?
>>> Thank you
>>> - - - - -
>>> # Richard Higgins
>>> # Durham University Library
>>> # Archives& Special Collections
>>> # Palace Green
>>> # Durham
>>> # DH1 3RN
>>> # E-Mail: r.i.higg...@durham.ac.uk
>>>
>>>
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>>> Save $700 by Nov 18
>>> Register now
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>>> Fedora-commons-users mailing list
>>> Fedora-commons-users@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/fedora-commons-users
>>
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