Re: My own rules in Jena Fuseki

[Andy Seaborne]

On 08/10/2020 19:22, Marcelo Machado wrote:
Hello Andy,

I manually escaped \n and " characters and some errors were corrected,
thanks.  However, consider that I want to use the following string rules (
string_rules_variable):

I think (maybe someone can confirm) ja:rule is one or more rules, but 
not a full rules file with features of prefixes and other directives.

Does a rule if you use URIs?

    Andy


#-*-mode: conf-unix-*-
@prefix time: <http://www.w3.org/2006/time#>
@include <owlmicro>

-> table(owl:sameAs).

#-----------------------------

sameAs_symmetry:
(?x owl:sameAs ?y)
-> (?y owl:sameAs ?x).

And as I said before this is how I am using in fuseki:
:model_inf a ja:InfModel ;
      ja:baseModel :tdbGraph ;
      ja:reasoner [
          ja:reasonerURL <http://jena.hpl.hp.com/2003/GenericRuleReasoner> ;
          ja:rule "[string_rules_variable]"`;

But Fuseki is not recognizing prefix:


org.apache.jena.assembler.exceptions.AssemblerException: caught:
Expected '(' at start of clause, found @prefix



Do you have any thoughts on how to solve this?

Thanks in advance!






At.te,

Marcelo de Oliveira Costa Machado


Em qui., 8 de out. de 2020 às 05:47, Andy Seaborne <a...@apache.org>
escreveu:



On 08/10/2020 07:41, Marcelo Machado wrote:
I am trying to create my own property rules in fuseki. To do so I am
using
the Generic Rule Reasoning that allows me to use my own rules. When I use
this strategy with my rules in a file everything works fine:

:model_inf a ja:InfModel ;
      ja:baseModel :tdbGraph ;
      ja:reasoner [
          ja:reasonerURL <http://jena.hpl.hp.com/2003/GenericRuleReasoner>
;
          ja:rulesFrom <file://...> ;
      ] .

However, I would not want to use a file but add the rules directly as a
string. I tried just to copy the content of the rule files that worked in
the example above, but the repository was not created, apparently due to
special characters (e.g. #, \n...):

:model_inf a ja:InfModel ;
      ja:baseModel :tdbGraph ;
      ja:reasoner [
          ja:reasonerURL <http://jena.hpl.hp.com/2003/GenericRuleReasoner>
;
          ja:rule "[${string_rules_variable}]"`;

At a minimum that will need Turtle escapes for newlines. A NodeFormatter
   formst outout - the Turtle rules are available directly via
EscapeStr.stringEsc(string).

The full grammar details are here: https://www.w3.org/TR/turtle/#terminals

If you need to be it your self, it'll need newline  and " handling, two
character \n and \"

      Andy

      ] .
where ${string_rules_variable} (javascript string interpolation) contains
the rules read from the file.

So, what am I doing wrong? I believe this is about escaping special
characters, if so, what would be the way to resolve it?

At.te,

Marcelo de Oliveira Costa Machado