The current implementation only matches the triples when facts are updated. Do we have any plan to support built-in primitives?
such as the rule below, the rule will be evaluated when uri1 or uri2 is updated. [rule1: built-inName1(uri1, built-inName2(uri2)) -> xxxx ] Dave Reynolds <[email protected]> 于2023年1月28日周六 04:56写道： > Once a rule has triggered it will only retrigger if the data changes in > a way that affects that rule's bindings. So a rule which doesn't match > anything on the LHS will not normally be retriggered. > > The behaviour you are seeing is as expected for the rule system. > > If your goal is to do something whenever data changes irrespective of > what the change is then you either need a rule with a pattern that will > match any data i.e. (?s ?p ?o) or don't use rules but use graph > listeners via the GraphEventManager interface. > > Dave > > On 27/01/2023 21:31, L B wrote: > > Thanks for the test code. > > > > Please correct me if I am wrong. Per the doc of listStatements: Find all > > the statements matching a pattern. > > > > My problem is that when I update the facts, this rule is not be triggered > > (executed). I assume this rule will be triggered every time when the > fact > > is updated. > > > > On the other hand, a leading triple can bypass it. For example > > > > [test1: (a b ?c) now(?x) -> print(\"now test\") ]. When you update > triple > > (a, b, xxx), the rule will be executed. > > > > Lorenz Buehmann <[email protected]> 于2023年1月26日周四 > 23:13写道： > > > >> I cannot reproduce this. For example, the test code > >> > >> > >> public static void main(String[] args) { > >> String raw = "<http://ex.org/a> <http://ex.org/p> > >> <http://ex.org/b> ."; > >> Model rawData = ModelFactory.createDefaultModel(); > >> rawData.read(new StringReader(raw), null, "N-Triples"); > >> String rules = > >> "[test1: now(?x) -> print(\"now test\") ]"; > >> Reasoner reasoner = new > >> GenericRuleReasoner(Rule.parseRules(rules)); > >> InfModel inf = ModelFactory.createInfModel(reasoner, rawData); > >> System.out.println("A * * =>"); > >> StmtIterator iterator = inf.listStatements(null, null, > >> (RDFNode) null); > >> while (iterator.hasNext()) { > >> System.out.println(" - " + iterator.next()); > >> } > >> } > >> > >> > >> does in fact print "now test" to the console. > >> > >> > >> On 26.01.23 19:43, L B wrote: > >>> test1: now(?x) -> print("now test") > >> > > >
