Hi Luis Ramos, where can we find this substractDates builtin? I cannot find it in the source code:
https://github.com/apache/jena/tree/master/jena-core/src/main/java/org/apache/jena/reasoner/rulesys/builtins or the documentation: https://jena.apache.org/documentation/inference/#builtin-primitives There are lessThan, greaterThan builtins that evaluate to true if one data is more recent than another. Regards, Barry -----Original Message----- From: Luis Enrique Ramos García <[email protected]> Sent: dinsdag 21 januari 2020 10:56 To: [email protected] Subject: substractDate built in Dear friends, I a trying to perform some operations with dates using rules in jena. One of those is calculating ages. I found the built in subtractDates(x1, x2, x3), and at first I wonder if this is a valid jena built in?, at second, I implemented it with the rule 1 however it does not trigger as expected, thus I wonder if the built in is properly implemented?. The date format I am using is yyyy-MM-dd. @prefix ex: <http://www.example.com#>. [*rule1:* (?a ex:birthday ?d1) (?b ex:currentdate ?d2) subtractDates(?d1, ?d2 ,?age) -> (?a ex:currentage ?age )] Where, d1 and d2 are xsd date time values, and age is decimal. I also implemented the greater than with integer numbers, and I got the expected result, but I would like to know if there is a built in for date, where I could evaluate to true when a date is more recent than another?. Best regards Luis Ramos This message may contain information that is not intended for you. If you are not the addressee or if this message was sent to you by mistake, you are requested to inform the sender and delete the message. TNO accepts no liability for the content of this e-mail, for the manner in which you use it and for damage of any kind resulting from the risks inherent to the electronic transmission of messages.
