Extending SiDIF

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SiDIF Extension Proposal

Core Problem: Statements About Statements

Evolution of Statement Representation

• Natural language triple:

dad loves mom

• Raw Wikidata URLs:

https://www.wikidata.org/wiki/Q76 https://www.wikidata.org/wiki/Property:P26 https://www.wikidata.org/wiki/Q13133

• Same URLs as active links:

https://www.wikidata.org/wiki/Q76 https://www.wikidata.org/wiki/Property:P26 https://www.wikidata.org/wiki/Q13133

• Human-readable with links:

Barack Obama spouse Michelle Obama

Current Reference Using 'it'

• Basic reference to subject:

dad loves mom
https://www.wikidata.org/wiki/Q76 is wikidata_url of it

Need for Statement Part References

• Challenge: How to reference different parts of a statement?
• Options:
  • Using subject/predicate/object (full)
  • Using s/p/o (short)
  • Using subject/link/object (alternative)

Proposed Solution

• Example using full form:

Barack spouse Michelle
https://www.wikidata.org/wiki/Q76 is wikidata_url of subject
1992-10-03 is date of predicate
https://www.wikidata.org/wiki/Q13133 is wikidata_url of object

Bridging Paradigms

Object-Oriented to Semantic Web Bridge

• 'it' keyword bridges:
  • OO concepts (self/this/me)
  • Semantic Web references
• Indirection levels:

Person isA Concept
Person_Sparql is sparql_impl of subject
http://foaf/... is prefix_url of subject
foaf is prefix of subject
Barack1950 isA Person
"Barack" is firstname of subject

Real World Example: Obama Family

• Marriage statement with metadata:

Barack spouse Michelle
"1992-10-03" is startTime of predicate
"Trinity United Church of Christ" is place of predicate

• Name history with temporal metadata:

Michelle familyName "Obama"
"married name" is role of predicate
"1992-10-03" is startTime of predicate

Michelle familyName "Robinson"
"maiden name" is role of predicate
"1964-01-17" is startTime of predicate
"1992" is endTime of predicate

Semantic Web Integration

Description Logic Foundations

• Basic concepts:
  • T mit Balken (top concept)
  • Bottom concept (umgedrehtes T)
• Mappings:
  • OWL/Description Logic: Concepts, Roles, Individuals
  • RDF: Classes, Properties, Individuals

Implementation Examples

• Class hierarchy:

Concept subClassOf owl:Thing
owl:Nothing

• Instance relationships:

Barack rdfType Person

Technology Bindings

• Allows 1:n relationships:
  • Advantages: Flexibility for different implementations
  • Challenges: Increased complexity management

• Example bindings:

Person_Sparql is sparql_impl of subject
foaf is prefix of subject