owlready2.rply.LexingError: (None, 0) while setting a rule

[jfwei1992]

Hi all,

I am trying to load an ontology that contains multiple namespaces and insert some rules into it. I called method set_as_rule() then I was given an error:

owlready2.rply.LexingError: (None, 0)

A specific rule I am trying to put in is '_is.TiplocLocation(?c), rw.currentDewPoint(?c, ?d), rw.currentTemp(?c, ?e), greaterThan(?d, ?e) -> rw.hasPotentialLowAdhesion(?c, True)'

I guess it is because the appearance of multiple namespaces in one rule as the tutorial only demonstrates creating rules for one namespace.

Is there anything I can do to solve this? Thank you.

[Jiba]

Hi,

If there are several namespaces, you cannot indicate them with dot (e.g. currentDewPoint instead of rw.currentDewPoint). Then, set_as_rules accepts a second parameters, which is a list of Owlready namepaces (or ontologies). For example:

Imp().set_as_rule("TiplocLocation(?c), currentDewPoint(?c, ?d)...", [_is, rw])

Jiba

[jfwei1992]

Hi Jiba,

Thank you very much! I will try it asap.

[jfwei1992]

Hi Jiba,

Thanks to your advice, it works now. Additionally, is there any way to list inferred triples after run the reasoner?

Kind regards,

Jin

[Jiba]

Hi,

You can put the inferred triples in a separate ontology (using the with ontology:... syntax), and then save this ontology as NTriples to obtain the RDF triple (or use ontology.graph.dump() to display them in terminal).

Jiba

[jfwei1992]

Thank you very much. That is very useful!