Custom Rules in ORACLE 10g

Question

Hi,
I have an Ontology containing some sample triples.
for eg:
        v1:Item v1:hasCost "100"
        v1:Item v1:hasWarrantyForYears "3"
There are some instances of Item in the Ontology, with hasColor=100 and some with hasWarrantyForYears=3.
Now when ever an user asks for items with cost=100 then he should also get Items with warranty of 3 years.Is there any way that one can write a "User Defined Rule' in 10g so that this 'cost=100 or warranty=3' need not be mentioned in the SPARQL and can be implicitly reasoned using the Rule.
I have tried with this kind of a rule:
insert into mdsys.rdfr_ECORuleBase1 values( 'Rule1' ,
          '(?instance1 rdf:type v1:Item) (?instance1 v1:hasColor "RED")
          '(?instance2 rdf:type v1:Item) (?instance2 v1:hasWarrantyForYears "3")
          null ,
          '(?instance1 rdf:type ?instance2) ',
           sdo_rdf_aliases(
                                   sdo_rdf_alias('v1','http://localhost:8989#') ,
                                   sdo_rdf_alias('v2','http://localhost:8989#')
But this did not work. Please suggest me a good rule for this....
Thanks,
Rajesh.

Answer 1

Hi!
I am also trying on a rule much similar to what is being discussed here.
insert into mdsys.rdfr_RuleBase1 values
( 'Rule1' ,
'( ?instance rdf:type :ClassA)
(?instance :has_PropertyA ?a) (?a :hasValue ?c)',
'REGEXP_like(c, ''Open'')' ,
'(?instance :has_PropertyB ?b) (?b :hasValue "HIGH")' ,
sdo_rdf_aliases(...)
The purpose behind this rule is something like:
If I query for all instaces for ClassA that have the value of the property has_PropertyA as Open, then it should also give me all the instances that have a value for the property has_PropertyB as HIGH.
But when I query using this rule I donot get the required results.
The query is:
select j ID, c propertyA, d propertyB from table
( sdo_rdf_match ( '( ?instance rdf:type :ClassA)
(?instance :has_PropertyA ?a) (?a v2:hasValue ?c)
(?instance :has_ID ?i) (?i :hasValue ?j)
(?instance :has_PropertyB ?b) (?b :hasValue ?d)',
sdo_rdf_models( 'Model1' ) ,
sdo_rdf_rulebases(‘RuleBase1’) ,
sdo_rdf_aliases(…),
'c=''Open'''
But, I do not get all the extra instances that have propertyB = HIGH. I only get some extra instances wherein propertyA = Open and propertyB = HIGH. The query result leaves many instances where propertyB=HIGH, but the propertyA has many other values.
So, I am really stuck. I think there is something really wrong with the rule (that I have written). Maybe it needs to be modified to get what is expected. Please help.
Thanks
Bhaskar