I'm trying to use MarkLogic functions in SPARQL queries. According to https://docs.marklogic.com/guide/semantics/semantic-searches
"In addition to SPARQL functions, you can use XQuery or JavaScript built-in functions (for example, functions with the prefix fn, cts, math, or xdmp) in a SPARQL query where you can use a function, which includes FILTER, BIND, and the expressions in a SELECT statement." It appears to work in the query console, but only intermittently. Here's a small repeatable test case. For example, this, based on the example, works PREFIX cts: <http://marklogic.com/cts#> SELECT ?o WHERE { ?s ?p ?o FILTER (cts:contains(?o, cts:word-query(("sf")))) } But this, also based on the example, does not SELECT ?o WHERE { ?s ?p ?o FILTER (<http://www.w3.org/2005/xpath-functions#starts-with/>( ?o, "sf" ) ) } Replace "sf" with a string of your choosing. It returns a stack trace with "[1.0-ml] XDMP-UNDFUN: (err:XPST0017) Undefined function ()" Stack Trace At line 5 column 11: In sem:sparql("SELECT ?o WHERE { ?s ?p ?o FILTER (<http...", (), (), (), ()) 3. { 4. ?s ?p ?o 5. FILTER (<http://www.w3.org/2005/xpath-functions#starts-with/>( ?o, "sf" )) 6. } 7. At line 4 column 15: In xdmp:eval("import module namespace amped-qconsole = " http://marklogic....";, (fn:QName("","query"), "SELECT ?o WHERE { ?s ?p ?o FILTER (<http..."), <options xmlns="xdmp:eval"><database>11594626987012022161</database>...</options>) 2. WHERE 3. { 4. ?s ?p ?o 5. FILTER (<http://www.w3.org/2005/xpath-functions#starts-with/>( ?o, "sf" )) 6. } In the first grouping, the < before http is highlighted on line 5 and in the second line 4 is highlighted. I also tried using the fn: namespace: PREFIX fn: <http://marklogic.com/fn#> SELECT ?o WHERE { ?s ?p ?o FILTER (fn:starts-with( ?o, "sf" )) } And that returns "[1.0-ml] XDMP-UNDFUN: (err:XPST0017) Undefined function starts-with()" I've also tired fn:contains with the same result. This is on Marklogic 8.0-6.4, using developer license, but I also reproduced it on 9.0-1.1 with an enterprise license. And yes, before anyone tells me to do this a different way, I know I can do this in different ways in SPARQL. I just created a small repeatable query that illustrates the issue I'm having. I'm sure I'm doing something wrong, but I'm not sure what. Can you tell me what I'm doing wrong? Thanks, Steve
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