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Ontology Mapping Patterns doug foxvog 14 February 2005.

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Presentation on theme: "Ontology Mapping Patterns doug foxvog 14 February 2005."— Presentation transcript:

1 Ontology Mapping Patterns doug foxvog 14 February 2005

2 Introduction DIP/SEKT Combined Mediation Project Why Mapping Patterns? The Patterns Language for Expressing Patterns Summary

3 DIP/SEKT Combined Mediation Project The main activities of the effort were: –Design ontology mapping language –Design a mediation framework - Develop an ontology mapping patterns library - Deal with inconsistencies arising during mapping Mapping Patterns –SEKT d4.3.1 –Adrian, doug, Jos, Kerstin Mapping Language and Framework –SEKT d4.4.2, DIP d1.5 –Adrian, doug, Francisco, Jos, Livia

4 Why Mapping Patterns? Semantic Web will have many Ontologies Ontologies will be in Different Languages Ontologies will Cover Overlapping Topics Mappings are Needed For Interoperation Not all Mappings are Equivalence Mapping Patterns for Common Inter-topic Relations Developed

5 What Needs to be Mapped? Uni-directional vs. Bi-directional Mappings Mappings between Same Type of Model –Individuals, Classes, Relations/Attributes Mappings between Different Types Complex Mappings –Class + Attribute : Class –Individual + Attribute  Individual

6 Uni-directional vs. Bi-directional Mappings Each Use of Mapping is Unidirectional Mappings in Different Directions at Different Times More Compact to use Declarative Bidirectional Mapping Single Locus for Edits Conceptually Cleaner

7 Mapping between Same Type of Models Individual – Individual Class – Class Attribute – Attribute Relation – Relation String – String

8 Mapping between Different Types of Model Class – Individual –Brand Name Product Treated as Individual String – Individual/Class –Country Code, Course Number, Product, … Attribute Value – Class –Female – Female Animal Value in Different Units –Mile – Kilometer Conversion

9 Complex Mappings Class or Relation Intersection Class or Relation Union Class + Attribute : Class –Woman + hasSpouse => Wife Individual + Attribute  Individual –UK + primeMinisterIs  TonyBlair Attribute Count : Attribute Attribute Presence/Absence : Attribute/Class Mapping by rule

10 The Mappings Mappings among Classes Mappings among Relations Mappings between Individuals Inter-Type Mappings Attribute Value Mappings Complex Mappings

11 Mappings among Classes Equivalent Classes –O1:Person  O2:Human Subclass / Superclass –O1:Man => O2:HumanMale Class Intersection –O1:Person & O1:MaleAnimal  O2:HumanMale Class Union –O1:ChildWithIrishMom U O1:ChildWithIrishDad  O2:ChildWithIrishParent

12 Mappings among Relations Equivalent Relations Subrelation – Superrelation Mapping Negated Relation Mapping –~(O1:A(X 1 X 2 )) => O2:B(Y 1 Y 2 ) Inverted Argument (Sub)Relation Relation Union / Intersection Attribute Transitive Closure –tran(O1:parent) => O2:ancestor Sub-Attribute Value

13 Mappings between Individuals Equivalent Individuals Functionally specified Individual –capitalOf + Mongolia  UlaanBaatar Relations among Classes which are Treated as Individuals not Explored

14 Inter-model Mappings Class – Individual (uni- and bi- directional) Inter-Attribute Value Mappings (whether Individual, Class, String, or Other) –subAttributeValueMapping( unidirectional O1:PhysOb.colour DeepGreen O2:Object:hasColor “Green”)

15 Complex Mappings Subclass by/with Attribute Mapping Subclass by/with Attribute Intersection Subclass by/with Attribute Union Subclass by/with Relation Domain/Range Subclass by/with Domain/Range Exclusion Subrelation by Domain/Range Restriction –O1:parentOf O1:FemaleAnimal O2:motherOf …

16 Complex Mappings (cont.) Class – Relation Mapping –classRelationMapping(O1:Marriage O2:marriedTo O1:Marriage.husband O1:Marriage.wife O1:Marriage.startDate) Mappings via Rule –relationMapping(bidirectional O1:distanceInMiles O2:distanceInKM equivalentIndividuals(X 1 Y 1 ) equivalentIndividuals(X 2 Y 2 ) milesToKM(X 3 Y 3 ))

17 Language for Expressing Mappings Examples equivalentClassMapping subclassMapping equivalentClassIntersectionMapping subclassUnionMapping subclassByAttributeMapping subclassByRuleMapping equivalentRelationMapping subrelationMapping attributeTransitiveClosureMapping attributeInverseMapping equivalentAttributeValueMapping equavalentRelationNegationMapping subrelationByRuleMapping equivalentIndividualMapping classMapping(two-way A B) classMapping(one-way A B) classMapping(two-way and(A 1 …A n ) B) classMapping(one-way or(A 1 …A n ) B) classMapping(one-way A B attributeValueCondition(Att AttValue)) classMapping(one-way A B {rule}) relationMapping(two-way P Q) relationMapping(one-way P Q) attributeMapping(two-way P trans(Q)) attributeMapping(two-way P inverse(Q)) attributeValueMapping(two-way P I Q J) relationMapping(two-way R not(S)) relationMapping(one-way R S {rule}) individualMapping(I J)

18 Summary DIP/SECT Project Researched Ontology Mediation and Mapping Set of Mapping Patterns were created. –Unidirectional and Bidirectional –Simple and Complex Language Designed for Encoding Mapping Patterns

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