Kevin,

Try using the functions without the sp: prefix, just isLiteral(…) and so on. 
These are SPARQL built-in functions. The sp: namespace is just how the built-in 
functions are represented in SPIN's RDF representation of SPARQL queries. 

Hope that helps,
Richard


> On 6 Nov 2015, at 18:11, Kevin Gupton <[email protected]> wrote:
> 
> (Sorry if this double posts; my earlier post has not appeared)
> 
> I'm having trouble accomplishing something simple that seemingly should be 
> straightforward.  I'm trying to use sp:isLiteral, sp:isURI, sp:isBlank, etc. 
> but get a "no registered function factory" error for all.
> 
> Example:
> 
> SELECT ?s ?p ?o
> WHERE {
>    ?p rdf:type owl:ObjectProperty .
>     ?s ?p ?o .
> FILTER (  sp:isLiteral(?o) ) .
> }
> 
> The sp: namespace is declared, all the right imports seem to be present 
> (using a new "RDF/OWL/SPIN File"), and those functions "autocomplete" for me 
> in the SPARQL editor.
> 
> I appreciate any suggestions.
> 
> I'm running TBC Standard Ed. v5.0.1
> 
> V/R,
> Kevin
> 
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