On Wed, Feb 25, 2015 at 10:51 AM, Miguel Bento Alves
<[email protected]> wrote:
>
> I don’t understand how works lists in Jena rule engine. How can I create a
> list in Jena rules? Anyone has an example with lists in jena rules to
> understand better how it works?
>
Make sure you understand how RDF lists work, first. They're just
singly linked lists where a list node is some resource, the element of
the node is indicated by rdf:first, and the rest of the list is
indicated by rdf:rest. There's also rdf:nil as the empty list. So an
RDF list of "a" and "b" might be:
[ rdf:first "a" ; rdf:rest [ rdf:first "b" ; rdf:rest rdf:nil ] ]
So you'd create a list by creating resources (often, but not
necessarily, blank nodes), and adding rdf:first and rdf:rest
properties to them. There are some builtins (e.g., listContains,
listNotContains, listEntry, listLength, etc.) that make working with
lists a bit easier.
//JT
--
Joshua Taylor, http://www.cs.rpi.edu/~tayloj/
