Thanks, Andy!
I am trying to get the exact string for the "<http://example/xyz/foo>" part
in your message. However, the model I loaded into Jena from the RDF xml
doesn't have a default namespace.
Here are my findings:
When I print out with the following debug lines:
System.out.println("URI = " +
soln.get("?o").asResource().getURI());
System.out.println("Local Name = " +
soln.get("?o").asResource().getLocalName());
System.out.println("Namespace = " +
soln.get("?o").asResource().getNameSpace());
System.out.println("Class = " + soln.get("?o").asResource().getClass());
I got:
Namespace = file:///C:/temp/myrdf.xml#
Class = class
com.hp.hpl.jena.rdf.model.impl.ResourceImpl
URI =
file:///C:/temp/myrdf.xml#_{0E43691F-0B64-42AF-AFCF-19BCC28ACBA3}
Local Name =
And when I tried to dump the model into a TURTLE format, I got the
following error:
{E211} Base URI is null, but there are
relative URIs to resolve.: <#_{0E43691F-0B64-42AF-AFCF-19BCC28ACBA3}>
And when I run the following SPARQL, it returned nothing:
select ?s ?p ?o where
{
?s ?p <file:///C:/temp/myrdf.xml/
_{0E43691F-0B64-42AF-AFCF-19BCC28ACBA3}> .
?s ?p ?o .
}
What did I miss?
Thanks a lot for your kindly help!!
- Charles
On Sun, Sep 1, 2013 at 4:30 AM, Andy Seaborne <[email protected]> wrote:
> On 01/09/13 01:39, Charles Li wrote:
>
>> Thanks, Rob!
>>
>> What I really need to do is to query by a given rdf:ID string, since I am
>> building an RDF/XML traversing tool. My challenge is how to quickly get
>> all
>> triples whose subject has a given RdfID.
>>
>> As you know rdf:ID is an RDF/XML artifact and there is no such a triple in
>> the model whose predicate is "ID". How would up come up with a SPARQL
>> query
>> to take a string of the rdf:ID input and return all triples whose subject
>> has the given RdfID?
>>
>> Any help is greatly appreciated!!!
>>
>
> rdf:ID is not a predicate; it's a syntax for the subject.
>
> If you have rdf:ID="foo"
> and the base URI for the data is http://example/xyz/
> then the subject is http://example/xyz/foo.
>
> Query with
>
> <http://example/xyz/foo> ?p ?o
>
> Try writing your data out as N-triples to Turtle to see the structure and
> the actual URIs.
>
> Andy
>
>
>
>> - Charles
>>
>>
>> On Sat, Aug 31, 2013 at 12:16 PM, Rob Vesse <[email protected]> wrote:
>>
>> There's no need to do a FILTER(?s IN sub query) and as you have found out
>>> this is actually illegal SPARQL
>>>
>>> You can however put the sub query in directly and get the desired effect.
>>> SPARQL evaluation is bottom up so the inner query gets evaluated first
>>>
>>> Rob
>>>
>>>
>>> ______________________________**__________
>>> From: Charles Li [[email protected]]
>>> Sent: 31 August 2013 09:36
>>> To: [email protected]
>>> Subject: How to filter SPARQL query with a list
>>>
>>> Hi, all Jena/SPARQL experts!
>>>
>>> I am composing a SPARQL query trying to list all triples whose subjects
>>> are
>>> in a list of RdfId's, and this list of RdfId's are from another select
>>> query:
>>>
>>> select ?s ?p ?o
>>> WHERE
>>> {
>>> ?s ?p ?o
>>> FILTER(?s in (
>>> select distinct ?s WHERE
>>> {
>>> ?s ?p ?o
>>> FILTER(contains(str(?o),
>>> "_{000E9C27-150C-480B-9CC7-**E23FFC62C90A}"))
>>> }
>>> ) &&
>>> !(contains(str(?o), "_{000E9C27-150C-480B-9CC7-**
>>> E23FFC62C90A}"))
>>> )
>>> }
>>> order by ?s
>>>
>>>
>>> However, the SPARQL query is not well-format, and it seems that it
>>> doesn't allow another "select" in place for the list of values.
>>>
>>> Can someone help me and advice how I can put in a list of RdfId's from
>>> another query (lines 6 - 10)?
>>>
>>>
>>> Thanks a lot!
>>>
>>> - Charles
>>>
>>>
>>
>
