simple query question

[andrew....@elucidbio.com]

hello,
the following query gets me all of my "readings" instances. How do I extend it to specify all readings with name "elucid:MaxThickness"? (name is a property).  (I know the question is trivial, thank you for bearing with folks on a learning curve.)

@
select ?s ?p (<http://elucidbio.com/kb/Reading> as ?o) ?g {
  { ?s ?p <http://elucidbio.com/kb/Reading> }
union
  { graph ?g { ?s ?p <http://elucidbio.com/kb/Reading> } }
}
@

Thank you,
Andy

[Pavel Klinov]

Hi Andy,

In the same way as you specified elucid:reading as your object: sub ?p by the IRI in both triple patterns, add (elucid:reading as ?p) to the projection, and don't forget to declare the namespace prefix elucid:

Cheers,

Pavel

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[Andrew J. Buckler (Elucid Bioimaging)]

Thank you Pavel, please corretc my syntax?  I tried a number of variatiosn but do not yet have it right.

select (<http://elucidbio.com/kb/85988275215718899248> as ?s) WHERE name elucid:MaxThickness ?g {
  { <http://elucidbio.com/kb/85988275215718899248> WHERE name elucid:MaxThickness }
union
  { graph ?g { <http://elucidbio.com/kb/85988275215718899248> WHERE name elucid:MaxThickness } }
}

---

From: Pavel Klinov <pa...@clarkparsia.com>
Sent: Wednesday, April 20, 2016 9:27 AM
To: sta...@clarkparsia.com
Subject: Re: [stardog-users] simple query question

 

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[Pavel Klinov]

PREFIX elucid:  <http://elucidbio.com/kb/>

select ?s (elucid:MaxThickness as ?p) (<http://elucidbio.com/kb/Reading> as ?o) ?g { 

  { ?s elucid:MaxThickness <http://elucidbio.com/kb/Reading> } 

union 

  { graph ?g { ?s elucid:MaxThickness <http://elucidbio.com/kb/Reading> } } 

}

[Andrew J. Buckler (Elucid Bioimaging)]

Ok; the following gets nothing back.  “name” is a property, “elucid:MaxThickness” is a value for that property.  Not a predicate, as this syntax implies?  In other words, I want the subset of readings that have the specific name.

[Pavel Klinov]

OK, I didn't realize "name" is the name of a property. 

How's your data modeled? Can you show a couple of triples for a particular reading? Normally I'd expect something like:

elucid:reading_1 rdf:type elucid:Reading .

elucid:reading_1 elucid:name elucid:MaxThickness

Then the query pattern would be: 

?reading a elucid:Reading ; 

               elucid:name elucid:MaxThickness .

Also note that since you only have a single named graph, and you know its IRI, your query can be simplified to:

SELECT * WHERE {

  graph <elucid:your-graph> {

    ?reading a elucid:Reading ; 

                   elucid:name elucid:MaxThickness . 

  }

}

Cheers,

Pavel

[Andrew J. Buckler (Elucid Bioimaging)]

Yes, that did it Pavel.  Thank you.