Higgins.owl 1.0

The current Higgins ontology temporarily attached here (v0.5.1) defines a base set of classes and properties. The previous version (v0.4.4) is still located at the official URL here: http://www.eclipse.org/higgins/ontologies/2006/higgins.owl but it will be replaced after a review of 0.5.1 has concluded.

Note: The properties of the Context container itself are attached to special object called ContextObject within the instance data and also described in the ontology.

Changes from 0.4.4 to 0.5.0:

1. ContextXRI property has been renamed ContextURI (the URI may be an XRI)
2. All "metadata" properties have been moved from AttributeStatements to a newly created class AttributeMetadata. This new class acts separates out metadata about Attributes (e.g. source) from the normal "values" of Attributes.
3. Two new kinds of metadata have been added: lastModified and syncConflict
4. XML/RDF in general has been cleaned up (more use of &xsd; &owl; etc.)
5. Ontology header has been cleaned up. It uses the owl:Ontology syntax. It has a version number (0.5.0). It also now also has a comment and a label.

Classes

1. AttributeDatatypeValue (subclass of AttributeValue)
2. AttributeMetadata
   • 0..1 hasSource
   • 0..N hasTimeSpan
   • 0..1 lastModified
   • 0..1 syncConflict
3. AttributeObjectValue
4. AttributeValue
   • 0..1 hasMetadata
   • 0..1 objectValue
   • 0..1 datatypeValue
5. ContextObject
   • 0..N hasContextRelationships
6. ContextRelationship
   • 0..N contextURI
7. DigitalSubject (see Digital Subject)
   • 1..1 uniqueIdentifier
   • 0..N hasTimeSpan
8. AttributeStatement (attributes of a Digital Subject)
   • 0..1 hasMetadata
9. SubjectRelationship a subClass of AttributeStatement
   • 1..1 contextURI
   • 1..1 subjectCUID
10. TimeSpan

Subclasses of AttributeValue

1. StringAttributeValue

DataType (literal valued) Properties

1. contextURI - domain(ContextRelationship, SubjectRelationship), range("anyURI")
2. identifier - domain(AttributeStatement), range(xsd:normalizedString)
3. lastModified - domain(AttributeMetadata), range(xsd:dateTime)
4. subjectCUID - domain(SubjectRelationship), range(xsd:normalizedString)
5. syncConflict - domain(AttributeMetadata), range(xsd:boolean)
6. uniqueIdentifier - domain(DigitalSubject), range(xsd:normalizedString). Uniquely identifies a DigitalSubject within a context
7. validFrom - domain(TimeSpan), range(xsd:date)
8. validTo - domain(TimeSpan), range(xsd:date)

Object (object valued) Properties

1. hasAttributeStatement - domain(DigitalSubject), range(AttributeStatement)
2. hasContextRelationship - domain(ContextObject), range(ContextRelationship)
3. hasMetadata - domain(AttributeStatement), range(AttributeMetadata)
4. hasSource - domain(AttributeMetadata), range(SubjectRelationship). The value is a DigitalSubjectRelationship that indicates the authoritative source of the AttributeStatement having this property
5. hasSubjectRelationship - domain(DigitalSubject), range(SubjectRelationship)
6. hasTimeSpan - domain(DigitalSubject, AttributeMetadata), range(TimeSpan)

Open Issues

1. We've agreed to add a "source" property to the Digital Subject's CUID. But does this really make sense at the DS instance level?