(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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