How to influence the seralization

Support
1

Hi,
Is there a way to influence the seralization of a query result. I don’t mean the option to choose the format (RDF/XML, Turtle, …) but within a given format.

For example, I have RDF-data ike this:

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"  xmlns:s="http://example/schema/">
  <rdf:Description about="http://example/alice">
    <s:likes rdf:resource="http://example/strawberry"
       s:color="red"
       s:taste="sweet"/>
    <s:likes rdf:resource="http://example/river"
       s:color="blue"
       s:temperature="cold"/>
  </rdf:Description>
</rdf:RDF>

The point here is that the information is nested: alice likes two objects (strawberry, river) which have properties on their own.

Now, let’s query this data with this construct:

prefix : <http://example/>
prefix s: <http://example/schema/>

construct {
  ?person s:likes ?object.
  ?object ?property ?value.
}
where {
  ?person s:likes ?object.
  ?object ?property ?value.
}

this returns all the information of the original data above. However, stardog serializes it in flat a structure:

<rdf:RDF>
    <rdf:Description rdf:about="http://example/alice">
        <s:likes rdf:resource="http://example/strawberry"/>
    </rdf:Description>
    <rdf:Description rdf:about="http://example/strawberry">
        <s:color>red</s:color>
        <s:taste>sweet</s:taste>
    </rdf:Description>
    <rdf:Description rdf:about="http://example/alice">
        <s:likes rdf:resource="http://example/river"/>
    </rdf:Description>
    <rdf:Description rdf:about="http://example/river">
        <s:color>blue</s:color>
        <s:temperature>cold</s:temperature>
    </rdf:Description>
</rdf:RDF>

Is there a way to force stardog to try to group information whenever possible in such a scenario?

Cheers,
Immanuel

2

It sounds like you’re looking for the RDF/XML-ABBREV syntax. It’s not a formal syntax and I don’t believe that Stardog supports it. At least it’s not listed as a format when running stardog help query execute. There are third party tools that will convert from what you’ve got to that syntax such as the Jena riot command.