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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