Does the REGEX function work with RELS-EXT in Fedora?
Querying our risearch in Fedora 3.4.1, find tuples, with SPARQL
outputting CSV thus
---------------
select ?RefNo ?hasLocalReferenceNumber from <#ri>
where {
?RefNo <fedora-rels-ext:hasLocalReferenceNumber>
?hasLocalReferenceNumber
}
---------------
returns
---------------
<sparql><head><variable name="RefNo"/><variable
name="hasLocalReferenceNumber"/></head>
<results>
<result><RefNo
uri="info:fedora/UkDhU:c5c99db0-a962-4075-9e76-6441a728444f"/><hasLocalR
eferenceNumber uri="UkDhU:SAD.204/4"/></result>
<result><RefNo
uri="info:fedora/UkDhU:abecf7d9-edbd-4d80-9243-182796d3a043"/><hasLocalR
eferenceNumber uri="UkDhU:DCD.Misc.Ch.3650"/></result>
</results>
</sparql>
or as CSV
"RefNo","hasLocalReferenceNumber"
info:fedora/UkDhU:c5c99db0-a962-4075-9e76-6441a728444f,UkDhU:SAD.204/4
info:fedora/UkDhU:abecf7d9-edbd-4d80-9243-182796d3a043,UkDhU:DCD.Misc.Ch
.3650
--------------
but
-------------
select ?RefNo ?hasLocalReferenceNumber from <#ri>
where {
?RefNo <fedora-rels-ext:hasLocalReferenceNumber>
?hasLocalReferenceNumber .
FILTER regex(?hasLocalReferenceNumber, "U", "i" )
}
-----------
returns an empty
-----------
<sparql><head><variable name="RefNo"/><variable
name="hasLocalReferenceNumber"/></head>
<results>
</results>
</sparql>
or as CSV
"RefNo","hasLocalReferenceNumber"
------------
Now, is this because you can only have URIs in rels-ext values and
SPARQLs regex doesn't works with URIs? If that is so, presumably you
cannot use regex in Fedora? And I need Yet Another Datastream instead of
this more succinct solution?
Sorry for the long email.
- - - - -
# Richard Higgins
# Durham University Library
# Archives & Special Collections
# Palace Green
# Durham
# DH1 3RN
# E-Mail: r.i.higg...@durham.ac.uk
-----Original Message-----
From: Scott Hammel [mailto:sc...@clemson.edu]
Sent: 11 November 2011 14:10
To: Support and info exchange list for Fedora users.
Subject: Re: [fcrepo-user] Wild card searching of Resource Index
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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>>> https://lists.sourceforge.net/lists/listinfo/fedora-commons-users
>>
>>
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Free/Busy Calendar: http://bit.ly/dBeBzo
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