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==Version 1.0==
 
==Version 1.0==
 
* This page summarizes the higgins.owl ontology here http://www.eclipse.org/higgins/ontologies/2006/higgins used by Higgins 1.0.  
 
* This page summarizes the higgins.owl ontology here http://www.eclipse.org/higgins/ontologies/2006/higgins used by Higgins 1.0.  

Revision as of 07:46, 16 December 2008

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Higgins logo 76Wx100H.jpg

Version 1.0

Note: In the Identity Attribute Service the term "Digital Subject" was changed to "Node" just before the release of Higgins 1.0. However, the term was not changed in version 1.0 of higgins.owl where the term "Digital Subject" remains.

Context Ontologies

Every Context can defines its own ontology. This ontology declares the OWL classes and properties used by instances within that Context. This Context-defined ontology must be based on higgins.owl (i.e. it must import higgins.owl).

Classes

This section is a summary of the main classes in higgins.owl. Each numbered item lists a class (e.g. "Attribute"). The sub-items show properties defined for this class (e.g. "source") prefixed by the cardinality of this property on this class (e.g. "O..N").

Note: subclasses of SimpleValue are listed separately in the next section to reduce clutter.

Classes in alphabetic order:

Attribute
Instances of this class are used as the domain of a set of higgins:metadata properties that, taken together, are considered to be the metadata about a higgins:attribute sub-property.
ComplexValue
subclass of Value
ContextId
URI of a Context
ContextObject
  • 0..N hasContextRelations
ContextRelation
  • 0..N contextId
SimpleValue (subclass of Value)
  • 1..N simpleValue
Digital Subject
  • 1..1 uniqueIdentifier
  • 0..N timeSpan
  • 0..N attribute
SubjectRelation
Subclass of ComplexValue.
  • 1..1 contextId
  • 1..1 subjectId
SubjectCorrelation
Subclass of SubjectRelation. If DigitalSubject A has a correlation relation to DigitalSubject B, this implies that that A and B represent different representations of the same underlying Entity. This relation only navigable in one direction: in this example from A to B.
TimeSpan
  • 0..1 validFrom --if not present, assume validFrom is the beginning of time
  • 0..1 validTo --if not present, assume validTo is the end of time
Value
  • 0..N source
  • 0..N creator
  • 0..N creationTime
  • 0..N timeSpan
  • 0..1 lastModified
  • 0..1 syncConflict
  • 0..1 lastVerifiedFromSource
  • 0..1 lastVerifyAttempt

Subclasses of SimpleValue

The following mirror the XML Schema types recommended for use with OWL

  1. AnyURI
  2. Base64Binary
  3. Boolean
  4. Byte
  5. Date

...etc

DataType (literal valued) Properties

lastModified
  • domain: Value
  • range: xsd:dateTime
lastVerifiedFromSource
  • domain: Value
  • range: xsd:dateTime
lastVerifyAttempt
  • domain: Value
  • range: xsd:dateTime
simpleMetadata
  • domain: Value, DigitalSubject
simpleValue
  • domain: SimpleValue
subjectID
  • domain: SubjectRelation
  • range: xsd:normalizedString
syncConflict
  • domain: Value
  • range: xsd:boolean
validFrom
  • domain: TimeSpan
  • range: xsd:date
validTo
  • domain: TimeSpan
  • range: xsd:date

Sub-Properties of simpleValue

  1. anyURI - domain(AnyURI), range(xsd:anyURI)
  2. boolean - domain(Boolean), range(xsd:boolean)
  3. base64Binary - domain(Base64), range(xsd:base64Binary)

...etc for all of the rest of the XML Schema datatypes

Object (object valued) Properties

  1. attribute - domain(DigitalSubject, ContextObject, ComplexValue), range(Value, Attribute)
  2. complexMetadata - domain(DigitalSubject, Attribute)
  3. complexValue - domain(ComplexAttribute)
  4. contextID - domain(ContextRelation, SubjectRelation), range(ContextID)
  5. contextRelation - domain(ContextObject), range(ContextRelation)
  6. source - domain(Attribute), range(SubjectRelation). The value is a SubjectRelation that indicates the authoritative source of the value of this Attribute
  7. timeSpan - domain(DigitalSubject, Attribute), range(TimeSpan)
  8. uniqueIdentifier - domain(DigitalSubject), range(higgins:StringSimpleAttribute). Uniquely identifies a DigitalSubject within a context

Annotation Properties

The following have been copied verbatim from http://protege.stanford.edu/plugins/owl/owl-library/2005/08/07/xsp.owl. These allow us to express the semantics of XML Schema within a Higgins-based ontology RDF file.

  1. base
  2. fractionDigits
  3. length
  4. maxExclusive
  5. maxInclusive
  6. maxLength
  7. minExclusive
  8. minInclusive
  9. minLength
  10. pattern
  11. totalDigits

Misc Notes

The value of the uniqueIdentifier attribute is immutable. All Digital Subjects have exactly one uniqueIdentifier attribute whose value is set when the Digital Subject is instantiated.

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.

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