Hi Lorenz, I will follow it then, and try to get it working.
by the way, in the documentation refereed to lessThan, and greaterThan says the following: Test if x is <, >, <= or >= y. Only passes if both x and y are numbers or time instants (can be integer or floating point or *XSDDateTime*). Thus, for me it is clear than these builtins must evaluate to true or false in case of dates, as you say. I will implement this first, and comment the results. Best regards Luis Ramos El mié., 22 ene. 2020 a las 9:03, Lorenz Buehmann (< [email protected]>) escribió: > Well, this blog post is about creating a custom rule primitive, and this > is also what you'd have to do if you need some custom function that is > not already among the Jena built-ins. So if you really need such a > subtractDates function, why not following the blog and create and > register your own rule primitive? > > On 22.01.20 08:25, Luis Enrique Ramos García wrote: > > Dear friends, > > barry, here is the reference: > > > > > https://henrietteharmse.com/2018/04/21/creating-custom-rule-primitives-for-jena/ > > > > But, after searching more carefully, I found it is another tool using > jena, > > but not jena at all. > > > > So, I wanted to confirm that such builtin was available. > > > > By the way, you say if I use dates with lessThan and greaterThan they > > should resolve to true or false?, an specific date format for that? > > > > > > Luis Ramos > > > > El mar., 21 ene. 2020 a las 15:14, Nouwt, B. (Barry) > > (<[email protected]>) escribió: > > > >> 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. > >> >
