Thanks for taking a look, and finding the problem, Dave! I don't know how I missed that. Seems like a case of not seeing the trees because of the forest.
--- David --- with personal assistance by Siri > On Apr 28, 2016, at 3:48 AM, Dave Reynolds <dave.e.reyno...@gmail.com> wrote: > > Hi David, > >> On 27/04/16 23:27, Martin, David wrote: >> Rules engine built-ins that take numeric arguments, such as sum and >> greaterThan, are not working for me. My situation is as follows: >> >> I'm loading a simple NT file into a default model: >> Model contextData = FileManager.get().loadModel(contextPath, "N3"); >> >> The NT file includes the following triple: >> <item1> <hasHeight> >> "8"^^<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.w3.org_2001_XMLSchema_integer&d=CwIC-g&c=djjh8EKwHtOepW4Bjau0lKhLlu-DxM1dlgP0rrLsOzY&r=RvcUHmbqwXWRvprio0Md4_6qsPsb-hvwu22_Hd-fP_I&m=zY12eZypqbHFzLmEd-BtXmn7Ldz-wbMhYMkKRbuEyLY&s=A0ZCnA3lEfZmMJuRbxFZB3kjMYUuEfiwPSalXzjWLNw&e= >> > . >> >> I'm creating an inference model in the usual way: >> >> List rules = Rule.rulesFromURL("file:C:/test.rule"); >> Reasoner reasoner = new GenericRuleReasoner(rules); >> Infmodel inf = ModelFactory.createInfModel(reasoner, contextData); >> >> I have the following rule: >> >> [checkItemHeight: >> (?item, hasHeight, ?height), >> print('In checkItemHeight antecedent:', ?height), >> greaterThan(?height, >> "7"^^https://urldefense.proofpoint.com/v2/url?u=http-3A__www.w3.org_2001_XMLSchema_integer&d=CwIC-g&c=djjh8EKwHtOepW4Bjau0lKhLlu-DxM1dlgP0rrLsOzY&r=RvcUHmbqwXWRvprio0Md4_6qsPsb-hvwu22_Hd-fP_I&m=zY12eZypqbHFzLmEd-BtXmn7Ldz-wbMhYMkKRbuEyLY&s=A0ZCnA3lEfZmMJuRbxFZB3kjMYUuEfiwPSalXzjWLNw&e= >> ), >> -> >> print('In checkItemHeight:', ?height) >> ] >> >> The first print clause succeeds: >> 'In checkCarHeight antecedent:' >> '8'^^https://urldefense.proofpoint.com/v2/url?u=http-3A__www.w3.org_2001_XMLSchema_integer&d=CwIC-g&c=djjh8EKwHtOepW4Bjau0lKhLlu-DxM1dlgP0rrLsOzY&r=RvcUHmbqwXWRvprio0Md4_6qsPsb-hvwu22_Hd-fP_I&m=zY12eZypqbHFzLmEd-BtXmn7Ldz-wbMhYMkKRbuEyLY&s=A0ZCnA3lEfZmMJuRbxFZB3kjMYUuEfiwPSalXzjWLNw&e= >> >> but the call to greaterThan never succeeds; the rule never fires. I've >> tried different data types in the NT file and in the rules file, but nothing >> works. The *only* thing I can get to work is when I use two simple >> constants, with no datatype, in the rules file: >> greaterThan(8, 7), >> >> I've looked around for discussions and documentation related to this, and >> I've looked at the Jena source code for greaterThan, but to no avail. I'd >> greatly appreciate some clarification of what's going on here, and what >> approaches*will* work. > > My first thought was "that certainly should have worked" and it took a while > to spot the deliberate mistake ... > > The RDF namespace for XSD is > > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.w3.org_2001_XMLSchema-23&d=CwIC-g&c=djjh8EKwHtOepW4Bjau0lKhLlu-DxM1dlgP0rrLsOzY&r=RvcUHmbqwXWRvprio0Md4_6qsPsb-hvwu22_Hd-fP_I&m=zY12eZypqbHFzLmEd-BtXmn7Ldz-wbMhYMkKRbuEyLY&s=ZQUIuUP_BGNgQbkmNXGI159IIiDpS7vavTw_SiHLhZs&e= > not > > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.w3.org_2001_XMLSchema_&d=CwIC-g&c=djjh8EKwHtOepW4Bjau0lKhLlu-DxM1dlgP0rrLsOzY&r=RvcUHmbqwXWRvprio0Md4_6qsPsb-hvwu22_Hd-fP_I&m=zY12eZypqbHFzLmEd-BtXmn7Ldz-wbMhYMkKRbuEyLY&s=Ka1WP37ZOigM8tbnkH3GowMMlIeWEZ-HZzdHSK7VPYk&e= > > So what's happening is that both the NT parse and the rules parse are > creating typed literals but those literals don't have number semantics > because the URI is wrong. The greaterThan builtin returns false for > incomparable cases. > > If you change your data to be: > > <item1> <hasHeight> > "8"^^<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.w3.org_2001_XMLSchema-23integer&d=CwIC-g&c=djjh8EKwHtOepW4Bjau0lKhLlu-DxM1dlgP0rrLsOzY&r=RvcUHmbqwXWRvprio0Md4_6qsPsb-hvwu22_Hd-fP_I&m=zY12eZypqbHFzLmEd-BtXmn7Ldz-wbMhYMkKRbuEyLY&s=N43qbXYFgT-W-lRM2Kol6hTbIpCA7zGsVQQbwegvgJA&e= > > . > > Then the rule: > > [checkItemHeight: > (?item, data:hasHeight, ?height), > print('In checkItemHeight antecedent:', ?height), > greaterThan(?height, > "7"^^https://urldefense.proofpoint.com/v2/url?u=http-3A__www.w3.org_2001_XMLSchema-23integer&d=CwIC-g&c=djjh8EKwHtOepW4Bjau0lKhLlu-DxM1dlgP0rrLsOzY&r=RvcUHmbqwXWRvprio0Md4_6qsPsb-hvwu22_Hd-fP_I&m=zY12eZypqbHFzLmEd-BtXmn7Ldz-wbMhYMkKRbuEyLY&s=N43qbXYFgT-W-lRM2Kol6hTbIpCA7zGsVQQbwegvgJA&e= > ) > -> > print('In checkItemHeight:', ?height) > ] > > works, as does > > [checkItemHeight: > (?item, data:hasHeight, ?height), > print('In checkItemHeight antecedent:', ?height), > greaterThan(?height, 7) > -> > print('In checkItemHeight:', ?height) > ] > > Dave
