semantic web - How can I model a complex relation between two resources? -


consider having relation/predicate between 2 resources: <#a> <#isrelatedto> <#b>.

i want add properties <#isrelatedto> relation: relation strength, description, etc.

so model this:

  1. define instances of predicate , add properties instances similar described here
  2. use quad store have unique id triple , add properties triple (problem have use triple store because of database restriction)
  3. define class of relations (isrelatedtoclass) have <#from>, <#to>, <#relstrength>, <#description> properties. create instances of class represent relation , connect , b.

e.g.: 

<#isrelatedtoinstance1> <rdf:type> <#isrelatedtoclass>   <#isrelatedtoinstance1> <#isrelated/from> <#a>   <#isrelatedtoinstance1> <#isrelated/to>   <#b>   <#isrelatedtoinstance1> <#isrelated/relstrength> "2"   <#isrelatedtoinstance1> <#isrelated/description> "some desc"

4 . other implementations?

practical examples be:
- connecting cities/countries transportation system each transport property has it's own properties
- connecting people want "x knows(since 1955) y" or "x rated(5 stars) zproduct"

apart rdf reification has been mentioned in comments, following: each pairs (a,b) in relationship wrt isrelatedto, create subproperty isrelatedto_a_b specify strength, description, etc.

<#a>  <#isrelatedto_a_b>  <#b> . <#isrelatedto_a_b>  rdfs:subpropertyof  <#isrelatedto>;     <#relstrength>  2;     <#description>  "a in relation b"@en .

you restrict isrelatedto_a_b hold pair (a,b), owl:

<#isrelatedto_a_b>  rdfs:domain  [      owl:class;     owl:oneof  ( <#a> ) ];  rdfs:range  [      owl:class;     owl:oneof  ( <#b> ) ] .

with care, make valid owl dl ontology.


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