Difference between revisions of "Higgins.owl 1.0"

Revision as of 15:06, 14 September 2007

This page summarizes the higgins.owl ontology here http://www.eclipse.org/higgins/ontologies/2006/higgins.owl

Every Context can defines its own ontology. This ontology defines the classes and attributes that that in turn describe data instances within a Context dataset. This Context-defined ontology must be based on 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.

1. Attribute. Instances of this class are used as the domain of higgins:metadata properties that, taken together, are considered to be the metadata about a higgins:attribute sub-property.

Classes in alphabetic order:

1. ComplexValue (subclass of Value)
2. ContextId - URI of a Context
3. ContextObject
   • 0..N hasContextRelations
   • UNDER DISCUSSION: the set of N optional metadata properties
4. ContextRelation
   • 0..N contextId
5. SimpleValue (subclass of Value)
   • 1..N simpleValue
6. Digital Subject
   • 1..1 uniqueIdentifier
   • 0..N timeSpan
   • 0..N attribute
7. SubjectRelation (subclass of ComplexValue) (see Subject Relation)
   • 1..1 contextId
   • 1..1 subjectId
8. Correlation (subclass of SubjectRelation). If DigitalSubject A has a Correlation relation to DigitalSubject B then this implies that that A and B represent different facets (personas, roles, etc.) of the same underlying Entity. This relation only navigable in one direction: in this example from A to B.
9. 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
10. Value
    • 0..N source
    • PROPOSED: 0..N creator
    • PROPOSED: 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

1. lastModified - domain(AttributeMetadata), range(xsd:dateTime)
2. lastVerifiedFromSource - domain(Attribute), range(xsd:dateTime)
3. lastVerifyAttempt - domain(Attribute), range(xsd:dateTime)
4. simpleMetadata - domain(Attribute, DigitalSubject)
5. simpleValue - domain(SimpleAttribute)
6. subjectCUID - domain(SubjectRelation), range(xsd:normalizedString)
7. syncConflict - domain(AttributeMetadata), range(xsd:boolean)
8. validFrom - domain(TimeSpan), range(xsd:date)
9. 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.

CVS Access

The following Eclipse Team Project Set (.psf) will give you access to the higgins.owl source file:

<?xml version="1.0" encoding="UTF-8"?>
<psf version="2.0">
 <provider id="org.eclipse.team.cvs.core.cvsnature">
  <project reference="1.0,
    :extssh:dev.eclipse.org:/cvsroot/technology,
    org.eclipse.higgins/ontology,org.eclipse.higgins.ontology"/>
 </provider>
</psf>

See Also

• Higgins Home]
• Higgins Wiki