Hi all,
Thanks very much Steve; your comments did help!
I had mis-interpreted the Mulgara documentation on <mulgara:is> which
states that it requires a non-variable value as its object. I had
assumed the non-variable value had to be a literal.
(My apologies to Egbert who indicated that earlier.)
Still unresolved is the more general query I posed in the original posting:
select $object, $label, $identifier
from <#ri>
where $object <fedora-model:label> $label
and $object <dc:identifier> $identifier
and $object <has_pid> 'demo*' in <#ri-fullText>
How does one specify the <has_pid> predicate/property in this query?
I suspect it's not possible - anyone able to confirm that?
Cheers!
Janna
Steve Bayliss wrote:
You've got a mistake still in your query
> / and $object <mulgara:is> 'info:fedora/demo:10' /
You should be specifying your Fedora object identifier as a URI, not a
literal, ie
/ /
/ and $object <mulgara:is> <info:fedora/demo:10> /
There's no such thing as "the '$object' concept" - $object is simply a
variable; you can substitue $object with $x (or $pid) and get the same
results.
NB for debugging, it's sometimes useful to show all relationships for
a particular object, so that you can see what triples actually exist
whilst debugging a query, for this you can use something like
select $s $p $o
from <#ri>
where
$s $p $o
and
$s <mulgara:is> <info:fedora/demo:10>
Hope that helps
Steve
-----Original Message-----
*From:* Janna Wemekamp [mailto:[email protected]]
*Sent:* 09 April 2009 04:31
*To:* Gramsbergen, Egbert
*Cc:* [email protected]
*Subject:* Re: [Fedora-commons-users] Questions re iTQL queries
involving PIDs
Thanks for the responses.
However, the query
/select $object $label $identifier $state
from <#ri>
where $object <fedora-model:label> $label
and $object <dc:identifier> $identifier
and $object <fedora-model:state> $state
and $object <mulgara:is> 'info:fedora/demo:10'/
doesn't return any results either. (Yes, there is an object with
pid demo:10.)
I'm beginning to wonder whether '$object' and 'pid' are considered
quite
different beasties by FedoraCommons even though they 'look' the
same in a query
result...
(And, I have read the documentation on the mulgara web-site
several times. It
doesn't define the '$object' concept.)
Cheers.
Janna Wemekamp
Gramsbergen, Egbert wrote:
Back to the original question: try with
$object <mulgara:is> <info:fedora/demo:10>
That should work.
Success,
Egbert Gramsbergen
-----Original Message-----
From: arne anka [mailto:[email protected]]
Sent: Wed 4/8/2009 12:37 PM
To: [email protected]
<mailto:[email protected]>
Subject: Re: [Fedora-commons-users] Questions re iTQL queries
involving PIDs
fighting with itql since yesterday again ...
> (1) The query:
>
> select $object from <#ri> where $object <mulgara:is> 'demo'
>
> returns a single element:
>
> <result>
> <object>demo</object>
> </result>
>
> even though there is no object in the repository with this PID.
of course it does -- you defined that $object _is_ 'demo'.
so, that's what you get.
> I'd like to be able to issue queries like:
>
> select $object $label $identifier $state
> from <#ri>
> where $object <fedora-model:label> $label
> and $object <dc:identifier> $identifier
> and $object <fedora-model:state> $state
> and $object <mulgara:is> 'demo:10'
>
> This query returns no results even though the PID 'demo:10' exists.
> What am I doing wrong?
you never really got $object -- what you do is saying that
$object has the
model $label.
but since $label is never assigned a value ...
> (2) I'd also like to perform wild-card searches on PIDs; for
example
>
> select $object, $label, $identifier
> from <#ri>
> where $object <fedora-model:label> $label
> and $object <dc:identifier> $identifier
> and $object <has_pid> 'demo*' in <#ri-fullText>
>
> How does one specify the <has_pid> predicate/property in this
query?
you might be able to taht with 'having'
> The following works quite happily but I'd not like to assume
that the DC
> identifier always matched the PID.
>
> select $object $label $identifier
> from <#ri>
> where $object <fedora-model:label> $label
> and $object <fedora-model:ownerId> $ownerId
> and $object <dc:identifier> $identifier
> and $object <dc:identifier> 'demo*' in <#ri-fullText>
>
well, basically, $object should be your id -- what you are doing
wrong is
getting $object at all.
imo it has to go like that:
select $object $label $identifier from <#ri> where $object
<fedora-model:hasModel> <info:fedora/my:model> and ...
or for your label (untested) something like:
select $object $label $identifier from <#ri> where $object
<fedora-model:label> 'a label name' and ...
see http://docs.mulgara.org/itqlcommands/select.html
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