Extending SiDIF

1. SiDIF Extension Proposal

1. 1. 1. Statement Representations and Evolution

1. 1. 1. 1.1 Natural Language Statement

dad loves mom

This represents the most basic, human-readable form of a statement. It contains: - subject (dad) - predicate (loves) - object (mom)

1. 1. 1. 1.2 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

Now each part has a unique identifier in the semantic web space. The first version shows the raw syntax, while the second version shows the actual linked URIs.

1. 1. 1. 1.3 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]

Combines human readability with semantic web identifiers.

1. 1. 2. Current SiDIF Reference Mechanism

1. 1. 1. 2.1 Using 'it' Keyword

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

'it' refers to the subject of the previous statement, bridging Object-Oriented concepts (this/self) with semantic web references.

1. 1. 1. 2.2 Proposed Extension for Statement Parts

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

Allows referencing any part of the previous statement.

1. 1. 3. Core Concepts and Bridging

1. 1. 1. 3.1 Fundamental Elements

Entity - Object
Link - relation between two objects

These map to both OO and Semantic Web paradigms: - OO: Objects and their relationships - Semantic Web: Resources and their properties

1. 1. 1. 3.2 Technology Integration Example

Person isA Concept

# Technology binding options
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

1. 1. 4. Semantic Web Foundation

1. 1. 1. 4.1 Description Logic Basis

OWL/Description Logic components: - Concepts (Classes) - Roles (Properties) - Individuals (Instances)

1. 1. 1. 4.2 RDF/OWL Mappings

# Class hierarchy
Concept subClassOf owl:Thing    # Top concept (T with bar)
owl:Nothing                     # Bottom concept (inverted T)

# Instance relationship
Barack rdfType Person          # Individual -> Class relationship

1. 1. 5. Design Decisions

1. 1. 1. 5.1 Reference Keywords Options

1. Full form: subject/predicate/object 2. Short form: s/p/o 3. Alternative: subject/link/object

1. 1. 1. 5.2 Key Bridging Concepts

1. 'it' semantics bridges:

  - OO: self/this/me
  - Semantic Web: subject reference

2. Statement part references enable:

  - Metadata about relationships
  - Integration with semantic web identifiers
  - Technology-specific bindings

1. 1. 1. 5.3 Relationship Considerations

# 1:n relations bring:
# Good: Flexibility for different tech bindings
# Challenge: Increased complexity
Person_Sparql is sparql_impl of subject
foaf is prefix of subject