Contexts and Importing in RDF
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1) The document proposes adding two new constructs, rdf:context and rdf:imports, to make contexts explicit in RDF graphs. 2) rdf:context would associate a context definition with an RDF graph, and rdf:imports would represent how knowledge is transferred between contexts during import operations between graphs. 3) Making contexts explicit would allow for reasoning about compatibility between contexts and partial reuse of knowledge between contexts through relations like compatible and incompatible.
Contexts and Importing in RDF
- 1. Contexts and Importing in RDF Jie Bao, Li Ding, and Deborah L. McGuinness Tetherless World Constellation Rensselaer Polytechnic Institute Troy, NY, 12180-3590, USA {baojie,dingl, dlm}@cs.rpi.edu
- 2. Context Matters - Provenance Stanford hasRole PostDoc stanford:LiDing HasAffiliation Stanford hasRole owl:sameAs RPI ResearchScientist hasRole rpi:LiDing HasAffiliation RPI 6/26/2010 W3C RDF Next Steps Workshop, Stanford 2
- 3. Context Matters - Assumptions rdf:type foaf:mbox owl:InverseFunctionalProperty ISWC Jie Bao foaf:mbox baojie@cs.rpi.edu J. Bao foaf:mbox Foo forum janesmith456 foaf:mbox n/a johnsmith123 foaf:mbox 6/26/2010 W3C RDF Next Steps Workshop, Stanford 3
- 4. Context Matters - “World” “Matrix” “Real World” South Park killed THEY Kenny rdf:type rdf:type Fictional People 0100010111010101010101010… 6/26/2010 W3C RDF Next Steps Workshop, Stanford 4
- 5. Contexts are • Something related to the meaning of a sentence – Provenance (who, when, where, how, etc) – Assumptions (e.g., OWA, UNA) – World – … • Claim: when a triple is published/reused/inferred, its context should be made explicit. 6/26/2010 W3C RDF Next Steps Workshop, Stanford 5
- 6. Wait • Don’t we already have – Named graph – C-OWL – N3 quotation – Contexts in AI –… 6/26/2010 W3C RDF Next Steps Workshop, Stanford 6
- 7. Named Graph Name = context Contexts are more than names Graph_RPI • One triple may be in {:LiDing :hasRole multiple contexts :ResearchScientist.} • One context may be reused • Relations between contexts need to be explicit, too. 6/26/2010 W3C RDF Next Steps Workshop, Stanford 7
- 8. C-OWL South Park • C-OWL provides an People ontology mapping language that respects contexts. into • Knowledge transfer is RealWorld controlled. Fictional People • Contexts are more than mapping 6/26/2010 W3C RDF Next Steps Workshop, Stanford 8
- 9. N3Logic rpi:LiDing says • Again, contexts are {rpi:LiDing :hasRole more than quotation. :ResearchScientist.} 6/26/2010 W3C RDF Next Steps Workshop, Stanford 9
- 10. Our Proposal • Based on named graph • Add two constructs • rdf:context • rdf:imports 6/26/2010 W3C RDF Next Steps Workshop, Stanford 10
- 11. Adding Contexts to RDF Part I: rdf:context Part II: rdf:import G1 rdf:imports G2. G rdf:context C. G1 rdf:context C1. G2 rdf:context C2. C may give a context • Importing as citation definition document • How knowledge G2 to G1 transferred from C agent LiDing. can be controlled by relations between C1 and C semantics OWL_Full C2. 6/26/2010 W3C RDF Next Steps Workshop, Stanford 11
- 12. Partial Reuse {s1 p1 o1.} rdf:imports {s3 p3 o3.} rdf:context C1. rdf:context C3. {s2 p2 o2.} rdf:imports rdf:context C2. C3 C3 rdfc:compatibleWith C1. C3 rdfc:incompatibleWith C2. 6/26/2010 W3C RDF Next Steps Workshop, Stanford 12
- 13. Reasoning with Contexts Context relations Context rules • Compatible • C is compatible with • Incompatible contexts with agent • Extend “rpi:LiDing” • In • C is compatible with contexts that are compatible with C2 Can be specified in OWL,RIF or other languages 6/26/2010 W3C RDF Next Steps Workshop, Stanford 13
- 14. Open Issues • Context specification – Provenance model? – Context relation vocabulary? • Formal semantics of contexts • Default contexts 6/26/2010 W3C RDF Next Steps Workshop, Stanford 14