Extending SiDIF

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SiDIF Extension Proposal

Statement Representations and Evolution

Natural Language Statement

The simplest form of a statement contains:

• subject
• predicate
• object

Example:

dad loves mom

Semantic Web Identifiers

The same triple structure with Wikidata URLs:

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

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

Human-Readable with Links

[https://www.wikidata.org/wiki/Q76 Barack Obama] [https://www.wikidata.org/wiki/Property:P26 spouse] [https://www.wikidata.org/wiki/Q13133 Michelle Obama]

Barack Obama spouse Michelle Obama

Current SiDIF Reference Mechanism

Using 'it' Keyword

The 'it' keyword refers to the subject of the previous statement:

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

Proposed Extension for Statement Parts

References to different parts of statements:

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

Core Concepts and Bridging

Fundamental Elements

• Core elements:
  • Entity - Object
  • Link - relation between two objects

• Paradigm mappings:
  • OO: Objects and their relationships
  • Semantic Web: Resources and properties

Technology Integration

Example of technology bindings:

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

Semantic Web Foundation

Description Logic Basis

• Components:
  • Concepts (Classes)
  • Roles (Properties)
  • Individuals (Instances)

RDF/OWL Mappings

Class hierarchy and instance relationships:

Concept subClassOf owl:Thing
owl:Nothing
Barack rdfType Person

Design Decisions

Reference Keywords Options

• Full form approach:
  • subject for the entity being described
  • predicate for the relationship
  • object for the target entity
• Short form approach:
  • s for subject
  • p for predicate
  • o for object
• Alternative approach:
  • subject for entity
  • link for relationship
  • object for target

Key Bridging Concepts

• 'it' semantics bridges:
  • OO: self/this/me concepts
  • Semantic Web: subject references
• Statement part references support:
  • Metadata about relationships
  • Integration with semantic web identifiers
  • Technology-specific bindings

Relationship Considerations

• 1:n relations characteristics:
  • Enables flexible technology bindings
  • Increases system complexity
  • Requires careful management

Example of 1:n relation expression:

Person_Sparql is sparql_impl of subject
foaf is prefix of subject