RDF/XML output differs between sparqlmotion and tbl/sparql

[Richard Nagelmaeker]

Hi all,

In EDG 6.4 we used sparqlmotion to retrieve RDF/XML and process this using some XSLT scripts.

Now we are using EDG 7.1.2 the sparqlmotion option is gone. So we access the sparql end-point directly. (tbl/sparql). Using application/rdf+xml in the accept header and posting a construct query. The RDF/XML produced has a different syntax form the one produced through sparqlmotion.

I used the Sparql end-point on EDG 6.4.3 as well, this gave the same result als EDG 7.1.2. So my assumption is that the difference stems from settings for sparqlmotion.

The RDF/XML from sparqlmotion has every subject wrapped in a rdf:Description

The RDF/XML from tbl/sparql has no rdf:Description and has every subject wrapped by it's type, also every subject now has nested subjects as well.

Is there a way to get the RDF/XML output from Sparqlmotion, with every subject wrapped in a rdf:Description?

Regards,

Richard

[Holger Knublauch]

Hi Richard,

the Jena API that we use under the hood has two dialects of RDF/XML syntax. One is called "RDF/XML Abbrev" and uses a less predictable, but more readable format, while the plain RDF/XML uses rdf:Descriptions that are more regular and thus attractive for XSLT. As you have found out, the SPARQLMotion servlet was only supporting the plain RDF/XML syntax.

Side note: The variations of syntax have been a major reason why RDF/XML has long become very unpopular for many users. In the early days RDF/XML was the only syntax for RDF and this backfired to the RDF data model as a general graph data representation mechanism. Many people have therefore moved to Turtle syntax.

One strategy to solve whatever you have to solve is to move the processing into the TopBraid server itself. For example, instead of having an external XSL processor work on the results of the SM calls, you could write a JavaScript or SWP script that operates on the graph itself, regardless of the syntax, and then produces exactly the output that you really want. Many TopBraid users seem to be quite content with JavaScript/ADS, see https://www.topquadrant.com/doc/7.2/scripting/index.html but if your XSLT is producing HTML you may also use SWP directly.

If you need to continue to use external XSLT, the SPARQL endpoint itself is NOT an option either, because if you run a CONSTRUCT there it can only produce abbreviated RDF/XML. However, you could use this SPARQL function

BIND (<http://topbraid.org/sparqlmotionfunctions#convertRDFToText>(<http://topbraid.org/sparqlmotionlib#RDFXML>) AS ?s)

to produce an RDF/XML string, which you could then return either from an SWP script or an ADS/JavaScript service. In SWP it would mean to first collect all relevant triples into ui:tempGraph using ui:update, and then do

<ui:setContext ui:queryGraph="{= ui:tempGraph }">
    <ui:return ui:result="{= smf:convertRDFToText(sml:RDFXML) }" />
</ui:setContext>

I am not sure what other technical background you have and whether these pointers are enough, so feel free to follow-up.

Holger

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[Richard Nagelmaeker]

Hi Holger,

Thank you for the extensive response. 

I'll go with your ADS suggestion:

If you need to continue to use external XSLT, the SPARQL endpoint itself is NOT an option either, because if you run a CONSTRUCT there it can only produce abbreviated RDF/XML. However, you could use this SPARQL function

BIND (<http://topbraid.org/sparqlmotionfunctions#convertRDFToText>(<http://topbraid.org/sparqlmotionlib#RDFXML>) AS ?s)

btw. I'm well aware of the RDF/XML position in the Linked Data community. But from a short- and long term cost perspective it's probably still the best there is. About turtle, my recent opinion is, that it's actually too good. It's so easy to read, people accept it as an end result. While it's actually a data format and as is true for all data formats, it's meant to transfer data between machines. 

If you look at it from that perspective, I think the toolset for turtle is limited and turtle itself is not extensible.

This is why I prefer XML over Turtle.

Kind regards.

Richard

[Richard Nagelmaeker]

Hi,

I'm still looking for a fitting solution. One is to use the SPARQL RESULT XML, as the output for a CONSTRUCT query. And transform it to RDF/XML. An other one is to use tbl/service:

Below an example URL: Where 'historie' is the name of a graph.

http://localhost:8099/tbl/service/historie/!/exportToRDF/rdfxml

Though it only returns the requested graph. Is there a way to get all imports included (graphWithImports) using this service method?

Thank you and regards,

Richard

[David Price]

Perhaps you could use Jena command line tool to copy to your preferred encoding. I think the tool is called riot.

I think NT would export fastest and then you could re-encode as rdfxml. Not great with huge files but might be ok otherwise.

Cheers,

David

On 7 Apr 2022, at 20:01, 'Richard Nagelmaeker' via TopBraid Suite Users <topbrai...@googlegroups.com> wrote:

Hi,

To view this discussion on the web visit https://groups.google.com/d/msgid/topbraid-users/af113da7-47e0-4aa9-ad58-e7fd870996f5n%40googlegroups.com.

[Holger Knublauch]

On 2022-04-08 5:01 am, 'Richard Nagelmaeker' via TopBraid Suite Users wrote:

Hi,

I'm still looking for a fitting solution. One is to use the SPARQL RESULT XML, as the output for a CONSTRUCT query. And transform it to RDF/XML. An other one is to use tbl/service:

Below an example URL: Where 'historie' is the name of a graph.

http://localhost:8099/tbl/service/historie/!/exportToRDF/rdfxml

Though it only returns the requested graph. Is there a way to get all imports included (graphWithImports) using this service method?

No, this service would only return the base graphs, not the imports closure.

Holger

To view this discussion on the web visit https://groups.google.com/d/msgid/topbraid-users/af113da7-47e0-4aa9-ad58-e7fd870996f5n%40googlegroups.com.

[Nagelmaeker, Richard (R.R.M.)]

Hi David,

 

Thank you for the suggestion. I didn’t know that Jena commandline tools, would work with EDG. I’ll look into it. But for now we have an HTTP based flow. So doing things using the command line, introduces another set of issues.

 

Cheers,

 

Richard

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[Nagelmaeker, Richard (R.R.M.)]

Thank you for your clear answer, Holger.

 

Regards,

 

Richard

 

Van: topbrai...@googlegroups.com [mailto:topbrai...@googlegroups.com] Namens Holger Knublauch
Verzonden: vrijdag 8 april 2022 00:51
Aan: topbrai...@googlegroups.com
Onderwerp: Re: [topbraid-users] RDF/XML output differs between sparqlmotion and tbl/sparql

 

 

On 2022-04-08 5:01 am, 'Richard Nagelmaeker' via TopBraid Suite Users wrote:

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