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https://issues.apache.org/jira/browse/JENA-1893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17098364#comment-17098364
] Marco Neumann commented on JENA-1893: ------------------------------------- Thank you for the reference Andy. I presume ARQ applies the semantics to afn:substr (afn:substring) . Since I was experimenting with both I have noticed here that if the index is out of (upper)bounds afn:substr doesn't report results while fn:substring does. PREFIX wdt: <http://www.wikidata.org/prop/direct/> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX lotico: <http://www.lotico.com/resource/> PREFIX loticoowl: <http://www.lotico.com/ontology/> PREFIX afn: <http://jena.apache.org/ARQ/function#> PREFIX fn:<http://www.w3.org/2005/xpath-functions#> SELECT (afn:substring(?cc,0,3) AS ?spc) WHERE{ BIND("DE" AS ?cc) . } vs SELECT (afn:substring(?cc,0,2) AS ?spc) WHERE{ BIND("DE" AS ?cc) . } > Variable not in scope for property function > -------------------------------------------- > > Key: JENA-1893 > URL: https://issues.apache.org/jira/browse/JENA-1893 > Project: Apache Jena > Issue Type: Question > Components: ARQ > Affects Versions: Jena 3.14.0 > Environment: ubunutu 19.10 > java 13 > Reporter: Marco Neumann > Priority: Trivial > > following query doesn't produce results for ?subpop > PREFIX loticoowl: <http://www.lotico.com/ontology/> > PREFIX fn:<http://www.w3.org/2005/xpath-functions#> > SELECT ?pop (fn:substring(?pop ,0,4) AS ?subpop) WHERE{ > ?x loticoowl:memberCount ?pop > } > http://query.lotico.com/#PREFIX%20loticoowl%3A%20%3Chttp%3A%2F%2Fwww.lotico.com%2Fontology%2F%3E%0APREFIX%20afn%3A%20%3Chttp%3A%2F%2Fjena.apache.org%2FARQ%2Ffunction%23%3E%0APREFIX%20fn%3A%3Chttp%3A%2F%2Fwww.w3.org%2F2005%2Fxpath-functions%23%3E%0A%0ASELECT%20%3Fpop%20%28fn%3Asubstring%28%3Fpop%20%2C0%2C4%29%20AS%20%3Fsubpop%29%20WHERE%7B%0A%20%20%20%20%20%20%20%3Fx%20loticoowl%3AmemberCount%20%3Fpop%0A%7D%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20 > a similar query on wikidata.org produces results as expected > https://query.wikidata.org/#PREFIX%20loticoowl%3A%20%3Chttp%3A%2F%2Fwww.lotico.com%2Fontology%2F%3E%0APREFIX%20afn%3A%20%3Chttp%3A%2F%2Fjena.apache.org%2FARQ%2Ffunction%23%3E%0APREFIX%20fn%3A%3Chttp%3A%2F%2Fwww.w3.org%2F2005%2Fxpath-functions%23%3E%0A%0ASELECT%20%3Fx%20%3Fpop%20%28fn%3Asubstring%28%3Fpop%20%2C0%2C3%29%20AS%20%3Fsubpop%29%20WHERE%7B%0A%20%20%20%20%20%20%20%3Fx%20wdt%3AP1082%20%3Fpop.%0A%20%20%20%20%20%20%20%3Fx%20wdt%3AP31%20wd%3AQ6256%0A%7D%20LIMIT%2010 -- This message was sent by Atlassian Jira (v8.3.4#803005)
