On 9/14/17 5:08 PM, Kingsley Idehen wrote: > On 9/14/17 4:52 PM, Kingsley Idehen wrote: >> On 9/13/17 10:28 AM, Adam Sanchez wrote: >>> Hi all, >>> >>> I am testing SPIN rules in the demo version of Virtuoso 8 but I have >>> still no success. >>> I wrote a simple SPIN rule to compute the area of an instance of a >>> class Rectangle given its width and its height. In this script you can >>> see all the queries I used. This script must be executed in the SQL >>> console of Virtuoso 8. >>> >>> https://tinyurl.com/yb359owr >>> >>> As you can see here at the bottom, >>> >>> http://imageshack.com/a/img923/1182/qG4HmJ.png >>> >>> the rule is loaded but it does not work when I run a query >>> >>> http://imagizer.imageshack.us/a/img922/7629/it260O.png >>> >>> For you reference, I was using this output as reference to see how the >>> loaded rule must look. >>> >>> https://tinyurl.com/ycm3zp6p >>> >>> Also, I have read these links so far >>> >>> https://medium.com/virtuoso-blog/virtuoso-8-0-creating-a-custom-inference-rules-using-spin-vocabulary-d7a060f859ef >>> https://www.mail-archive.com/virtuoso-users@lists.sourceforge.net/msg07790.html >>> https://www.linkedin.com/pulse/reasoning-inference-using-british-royal-family-part-idehen >>> https://medium.com/virtuoso-blog/using-british-royal-family-data-snippets-to-demonstrate-sparql-query-language-based-reasoning-56626a152419 >>> http://docs.openlinksw.com/virtuoso/udt_overview/ >>> >>> BTW, in RDF4j works. I do not need to load the rule separately, I just >>> loaded the full ontology and that's all, the SPIN rule worked. See >>> >>> http://imagizer.imageshack.us/a/img924/7717/Q9JYau.png >>> http://imagizer.imageshack.us/a/img924/9828/4dQPzg.png >>> >>> >>> Any idea? >>> >>> Thanks in advance, >>> >>> Adam >> Hi Adam, >> >> We don't have a problem with Virtuoso's SPIN Rules handling, once a few >> errors (I assume typos) in your example are fixed. Here's my rendition >> of what you shared: >> >> -- This a SPARQL script to test SPIN Rules in Virtuoso 8 >> -- It should compute the area of an instance of the class Rectangle >> given its width and its height. >> -- This script must be run in the SQL console of Virtuoso >> >> -- Additional commands >> >> SPARQL CLEAR GRAPH <http://geometry> ; >> SPARQL CLEAR GRAPH <urn:spin:rule:geometry:lib> ; >> SPARQL DROP SPIN LIBRARY <urn:spin:rule:geometry:lib> ; >> >> -- create a named graph >> >> -- SPARQL CREATE GRAPH <http://geometry> ; >> >> SPARQL >> PREFIX shapes: <http://example.org/shapes#> >> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> >> PREFIX owl: <http://www.w3.org/2002/07/owl#> >> >> WITH <http://geometry> >> INSERT { >> shapes:Rectangle >> rdf:type owl:Class . >> >> shapes:rectangle_1 >> rdf:type shapes:Rectangle ; >> shapes:height "5" ; >> shapes:width "49" . >> shapes:area rdf:type owl:DatatypeProperty . >> shapes:height rdf:type owl:DatatypeProperty . >> shapes:width rdf:type owl:DatatypeProperty . >> } ; >> >> -- create the rule >> -- SPARQL CREATE GRAPH <urn:spin:rule:geometry:lib> ; >> >> SPARQL >> PREFIX shapes: <http://example.org/shapes#> >> PREFIX spin: <http://spinrdf.org/spin#> >> PREFIX sp: <http://spinrdf.org/sp#> >> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> >> PREFIX owl: <http://www.w3.org/2002/07/owl#> >> >> WITH <urn:spin:rule:geometry:lib> >> INSERT { >> shapes:Rectangle >> rdf:type owl:Class; >> rdfs:label "Rectangle class"; >> spin:rule [ >> a sp:Construct; >> sp:text """ CONSTRUCT { ?this >> <http://example.org/shapes#area> ?area . } >> WHERE { ?this >> <http://example.org/shapes#width> ?width . >> ?this >> <http://example.org/shapes#height> ?height . >> BIND ((xsd:float(?height) * >> xsd:float(?width)) AS ?area) . >> } >> """ >> ] . >> } ; >> >> EXEC ('SPARQL ' || >> SPARQL_SPIN_GRAPH_TO_DEFSPIN('urn:spin:rule:geometry:lib')); >> >> -- run a sparql query to test the spin rule >> >> SPARQL >> DEFINE input:macro-lib <urn:spin:rule:geometry:lib> >> PREFIX shapes: <http://example.org/shapes#> >> >> SELECT * >> WHERE >> { >> ?s shapes:width ?w. >> ?s shapes:height ?h. >> OPTIONAL { ?s shapes:area ?area }. >> } ; >> >> >> All you have to do is copy, paste, and then run the script above via >> the HTM-based Admin UI (Conductor) or iSQL command-line (using LOAD >> <{file-name}>). >> >> As proof, I've loaded the script above into our public URIBurner >> instance, and have a sample SPARQL Query Result URI to share [1]. >> >> In relation to RDF4J and SPIN, you are making the mistake of comparing a >> RDF Data Access Layer (what RDF4J is) and a DBMS engine (what Virtuoso >> is). In both cases, a context for handling Custom Inference Rules needs >> to be established. In the case of Virtuoso, why should loading an >> Ontology imply Reasoning and Inference Context initialization for all >> users? In our opinion that is extremely dangerous and impractical, hence >> our use of pragmas that explicitly initialize Reasoning & Inference >> Context per SPARQL Query. >> >> Links: >> >> [1] >> http://linkeddata.uriburner.com/sparql?default-graph-uri=&query=DEFINE+input%3Amacro-lib+%3Curn%3Aspin%3Arule%3Ageometry%3Alib%3E%0D%0APREFIX+shapes%3A+%3Chttp%3A%2F%2Fexample.org%2Fshapes%23%3E%0D%0A%0D%0ASELECT+*%0D%0AWHERE%0D%0A++++%7B%0D%0A++++++++%3Fs+shapes%3Awidth+%3Fw.%0D%0A++++++++%3Fs+shapes%3Aheight+%3Fh.%0D%0A++++++++OPTIONAL+%7B+%3Fs+shapes%3Aarea++%3Farea+%7D.%0D%0A++++%7D&should-sponge=&format=text%2Fhtml&CXML_redir_for_subjs=121&CXML_redir_for_hrefs=&timeout=30000000 >> -- SPARQL Query Results page where solution is constructed with Custom >> Reasoning & Inference Context enabled. > > > Adam, > > Okay, the syntax worked, but I just realized the solution is incorrect > i.e., it doesn't change in response to enabling or disabling inference > context pragma. > > The rule itself might be suffering from an issue with BIND. Either > way, I'll confirm in another mail. >
Adam, Fixed script (note changes made to samples queries) which has been applied to our URIBurner instance: -- This a SPARQL script to test SPIN Rules in Virtuoso 8 -- It should compute the area of an instance of the class Rectangle given its width and its height. -- This script must be run in the SQL console of Virtuoso -- Additional commands SPARQL CLEAR GRAPH <http://geometry> ; SPARQL CLEAR GRAPH <urn:spin:rule:geometry:lib> ; SPARQL DROP SPIN LIBRARY <urn:spin:rule:geometry:lib> ; -- create a named graph -- SPARQL CREATE GRAPH <http://geometry> ; SPARQL PREFIX shapes: <http://example.org/shapes#> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX owl: <http://www.w3.org/2002/07/owl#> WITH <http://geometry> INSERT { shapes:Rectangle rdf:type owl:Class . shapes:rectangle_1 rdf:type shapes:Rectangle ; shapes:height "5" ; shapes:width "49" . shapes:area rdf:type owl:DatatypeProperty . shapes:height rdf:type owl:DatatypeProperty . shapes:width rdf:type owl:DatatypeProperty . } ; -- Test Generated Data Control Check SPARQL PREFIX shapes: <http://example.org/shapes#> PREFIX spin: <http://spinrdf.org/spin#> PREFIX sp: <http://spinrdf.org/sp#> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX owl: <http://www.w3.org/2002/07/owl#> # CONSTRUCT { ?this <http://example.org/shapes#area> ?area . } SELECT ?this ?area FROM <http://geometry> WHERE { ?this <http://example.org/shapes#width> ?width . ?this <http://example.org/shapes#height> ?height . BIND ((xsd:float(?height) * xsd:float(?width)) AS ?area) . } ; -- create the rule -- SPARQL CREATE GRAPH <urn:spin:rule:geometry:lib> ; SPARQL PREFIX shapes: <http://example.org/shapes#> PREFIX spin: <http://spinrdf.org/spin#> PREFIX sp: <http://spinrdf.org/sp#> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX owl: <http://www.w3.org/2002/07/owl#> WITH <urn:spin:rule:geometry:lib> INSERT { shapes:Rectangle rdf:type owl:Class; rdfs:label "Rectangle class"; spin:rule [ a sp:Construct; sp:text """ CONSTRUCT { ?this <http://example.org/shapes#area> ?area } WHERE { { SELECT ?this (xsd:float(?height) * xsd:float(?width)) AS ?area WHERE { ?this <http://example.org/shapes#width> ?width ; <http://example.org/shapes#height> ?height . # BIND ((xsd:float(?height) * xsd:float(?width)) AS ?area) . } } } """ ] . } ; EXEC ('SPARQL ' || SPARQL_SPIN_GRAPH_TO_DEFSPIN('urn:spin:rule:geometry:lib')); -- run a sparql query to test the spin rule -- Test 1 (Reasoning & Inference Context Enabled ) SPARQL DEFINE input:macro-lib <urn:spin:rule:geometry:lib> PREFIX shapes: <http://example.org/shapes#> SELECT * FROM <http://geometry> WHERE { ?s a shapes:Rectangle ; shapes:area ?area . } ; -- Test 2 (Reasoning & Inference Context Disabled ) SPARQL # DEFINE input:macro-lib <urn:spin:rule:geometry:lib> PREFIX shapes: <http://example.org/shapes#> SELECT * FROM <http://geometry> WHERE { ?s a shapes:Rectangle ; shapes:area ?area . } ; -- Test 3 (Reasoning & Inference Context Enabled ) SPARQL DEFINE input:macro-lib <urn:spin:rule:geometry:lib> PREFIX shapes: <http://example.org/shapes#> SELECT ?s xsd:float(?w) xsd:float(?h) xsd:float(?area) FROM <http://geometry> WHERE { ?s a shapes:Rectangle; shapes:width ?w ; shapes:height ?h . OPTIONAL { ?s shapes:area ?area }. } ; -- Test 4 (Reasoning & Inference Context Disabled ) SPARQL # DEFINE input:macro-lib <urn:spin:rule:geometry:lib> PREFIX shapes: <http://example.org/shapes#> SELECT ?s xsd:float(?w) xsd:float(?h) xsd:float(?area) FROM <http://geometry> WHERE { ?s a shapes:Rectangle; shapes:width ?w ; shapes:height ?h . OPTIONAL { ?s shapes:area ?area }. } Links: [1] http://linkeddata.uriburner.com/sparql/?default-graph-uri=&query=DEFINE+input%3Amacro-lib+%3Curn%3Aspin%3Arule%3Ageometry%3Alib%3E%0D%0APREFIX+shapes%3A+%3Chttp%3A%2F%2Fexample.org%2Fshapes%23%3E%0D%0A%0D%0ASELECT+%3Fs+xsd%3Afloat%28%3Fw%29+xsd%3Afloat%28%3Fh%29+xsd%3Afloat%28%3Farea%29+%0D%0AFROM+%3Chttp%3A%2F%2Fgeometry%3E%0D%0AWHERE%0D%0A%09%7B%0D%0A%09%09%3Fs+a+shapes%3ARectangle%3B%0D%0A%09%09+++shapes%3Awidth+%3Fw+%3B%0D%0A%09%09+++shapes%3Aheight+%3Fh+.%0D%0A%09%09OPTIONAL+%7B+%3Fs+shapes%3Aarea++%3Farea+%7D.%0D%0A%09%7D&should-sponge=&format=text%2Fhtml&CXML_redir_for_subjs=121&CXML_redir_for_hrefs=&timeout=30000000 -- SPARQL Query Results Page -- Regards, Kingsley Idehen Founder & CEO OpenLink Software (Home Page: http://www.openlinksw.com) Weblogs (Blogs): Legacy Blog: http://www.openlinksw.com/blog/~kidehen/ Blogspot Blog: http://kidehen.blogspot.com Medium Blog: https://medium.com/@kidehen Profile Pages: Pinterest: https://www.pinterest.com/kidehen/ Quora: https://www.quora.com/profile/Kingsley-Uyi-Idehen Twitter: https://twitter.com/kidehen Google+: https://plus.google.com/+KingsleyIdehen/about LinkedIn: http://www.linkedin.com/in/kidehen Web Identities (WebID): Personal: http://kingsley.idehen.net/public_home/kidehen/profile.ttl#i : http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this
smime.p7s
Description: S/MIME Cryptographic Signature
------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________ Virtuoso-users mailing list Virtuoso-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtuoso-users
