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
On 10/10/2017 8:15, Steve Ray (CMU) wrote:
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: [email protected]
Phone: (650) 587-3780
Cell: (202) 316-6481
Skype: steverayconsulting
cid:[email protected]
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