Trying to trick TBC Maestro (and TBL)

[Steve Ray (CMU)]

Hi,

            I’m working on a project where our installation of TBL is called by a system that expects to issue SPARQL queries to an endpoint, rather than calling a SPARQLMotion module as a web service. Until now, I have been successfully bypassing the web service call by directly calling the associated sm:Function instead. I would issue calls to the SPARQL endpoint such as:

 

SELECT ?response WHERE {BIND (<http://epic/scripts/triplestoreOperations#myFunction>() AS ?response)}

 

…where myFunction is associated with the return module via the sm:returnModule property.

 

This works fine, even with input arguments as you might expect. However, in the past I was always using a “Return text” module.

 

What I’m trying to do now is to use a “Return RDF” module as the final module in the script, rather than “Return text”, in the hopes of a cleaner result. (The return text serializations (as JSON) contained lots of extra header info that I am hoping to avoid).  My SPARQLMotion script works fine when I call it the way your documentation expects:

 

http://localhost:8083/tbl/sparqlmotion?&id=myFunction

 

…but it comes back empty when I use the SELECT call through the SPARQL endpoint. Clearly there is some subtlety that I’m not appreciating. Can’t I bind my ?response variable to a serialized graph, as specified in the “Return RDF” module?

 

Any ideas?

 

 

- Steve

 

Steven R. Ray, Ph.D.

Distinguished Research Fellow

Carnegie Mellon University

NASA Research Park

Building 23 (MS 23-11)

P.O. Box 1
Moffett Field, CA 94305-0001

Email:    stev...@sv.cmu.edu

Phone: (650) 587-3780

Cell:      (202) 316-6481

Skype: steverayconsulting

 

[Holger Knublauch]

Hi Steve,

SM functions cannot use sml:ReturnRDF. Instead, could you try continue to use sml:ReturnText but turn the RDF graph into a string just beforehand, using smf:convertRDFToText?

HTH
Holger

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