Re: CONSTRUCT an RDF Datest

• From: Tara Athan <taraathan@gmail.com>
• Date: Sat, 28 Nov 2015 20:45:57 -0500
• To: public-sparql-dev@w3.org
• Message-ID: <565A58D5.9090502@gmail.com>

Update: In a private reply, someone mentioned that it is possible to 
create and update named graphs in a Graph Store, e.g. with the SPARQL 
Update language. However, in my usecase, I am only interested in 
creating an immutable RDF Dataset, not a mutable Graph Store. This hint 
was useful in letting me see what a CONSTRUCT for an RDF Dataset might 
look like, though (patterned after INSERT).

For example, suppose I want to filter an RDF Dataset to extract a new 
dataset where only named graphs having a metadata triple in the default 
graph matching a certain filter are retained. It might be expressed so:

CONSTRUCT
  { ?name ex:observedAt ?date
   GRAPH ?name
    { ?s ?p ?o}
}
WHERE
  {
   { ?name ex:observedAt ?date }
   GRAPH ?name
       {?s ?p ?o}
   FILTER (?date > 2015-06-01)
}

Is there any theoretical or technical obstacle to this?

Tara

Received on Sunday, 29 November 2015 01:46:32 UTC