DSpace 2.0/Modelling Fedora in RDF

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Here is a recent translation of the Fedora Rels Ext ontology in n3 for discussion purposes

Contents

[edit] Namespaces

These are the namespace/prefix mappiings utilized int he examples below 

@prefix r: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix s: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix rels: <info:fedora/fedora-system:def/relations-external#>.

[edit] Abstract Fedora Relationship

The primitive property for all object-to-object relationships in the fedora ontology 

<rels:fedoraRelationship>
   a    r:Property.

Comments:

  • This can be classified as similar to a UML Association (representing some sort of relationship between two objects) --Mark Diggory 16:59, 1 October 2008 (EDT)

[edit] Abstract Parts

Is Part Of
A definition of the generic part/whole relationship between fedora objects. The subject is a fedora object representing a part and the predicate is a fedora object representing a whole. 

<rels:isPartOf>
   a    r:Property;
   s:subPropertyOf
      <rels:fedoraRelationship>.

Has Part
A definition of the generic part/whole relationship between fedora objects. The subject is a fedora object representing a whole and the predicate is a fedora object representing a part. 

<rels:hasPart>
   a    r:Property;
   s:subPropertyOf
      <rels:fedoraRelationship>.

Comments:

[edit] Constituents

Is Constituent Of
This is a refinement of the generic part/whole relationship in the "made of" sense with referential integrity implications. The subject is a fedora object representing a constituent part and the predicate is a fedora object representing a whole of which the subject is a constituent. The constituent part cannot stand alone in any meaningful way without reference to the whole. 

<rels:isConstituentOf>
   a    r:Property;
   s:subPropertyOf
      <rels:isPartOf>.

Has Constituent
This is a refinement of the generic part/whole relationship in the "made of" sense with referential integrity implications. The subject is a fedora object representing a whole that is made of constituent parts and the predicate is a fedora object representing one of the constituent parts. The whole loses its integrity if the constituent part is removed. 

<rels:hasConstituent>
   a    r:Property;
   s:subPropertyOf
      <rels:hasPart>.

Comments:

  • This is a further refinement a Composition Association, forcing referential integrity to be maintained, I'm not 100% convinced its neccessary but may have a usefulness if the system is allowing Compositions that do not require addressablitiy. --Mark Diggory 17:24, 1 October 2008 (EDT)

[edit] Members

Is Member Of
This is a refinement of the generic part/whole relationship that defines a set membership relationship between fedora objects. The subject is a fedora object representing a member of a set and the predicate is a fedora object representing a whole set of which the subject is a member. The member can be separated from the set and still stand alone as an object in its own right. 

<rels:isMemberOf>
   a    r:Property;
   s:subPropertyOf
      <rels:isPartOf>.

Has Member
This is a refinement of the generic part/whole relationship that defines a set membership relationship between fedora objects. The subject is a fedora object representing a whole set and the predicate is a fedora object representing a member in the set. The set does not lose its integrity if a member is removed from the set. 

<rels:hasMember>
   a    r:Property;
   s:subPropertyOf
      <rels:hasPart/>.

Comments:

  • I'm not convinced this is very different at all from a "hasPart" because "Constitutent" could just be considered a restriction on Membership. --Mark Diggory 17:26, 1 October 2008 (EDT)

[edit] Subsets

Is Subset Of
This is a refinement of the generic set membership relationship to indicate the notion of a subset. The subject is a fedora object that represents a subset and the predicate is a fedora object that represents the set of which the subject is a subset. 

<rels:isSubsetOf>
   a    r:Property;
   s:subPropertyOf
      <rels:isMemberOf>.

Has Subset
This is a refinement of the generic set membership to indicate the notion of a subset. The subject is a fedora object that represents a set of objects and the predicate is a fedora object that represents a subset of the subject set. 

<rels:hasSubset>
   a    r:Property;
   s:subPropertyOf
      <rels:hasMember>.

Commnets:

  • I wonder about this one as well, because RDF is an open model, unless stated otherwise, almost any relation may be expressed by another agnet/authority to the point that there may be additional assertions of inclusion into any such Collection. --Mark Diggory 17:29, 1 October 2008 (EDT)

[edit] Collections

Is Member of Collection
This is a refinement of the generic membership relationship to indicate the notion of a digital collection. The subject is a fedora object representing an item in a digital collection and the predicate is a fedora object representing a whole digital collection. 

<rels:isMemberOfCollection>
   a    r:Property;
   s:subPropertyOf
      <rels:isMemberOf>.

Has Collection Member
This is a refinement of the generic membership to indicate the notion of a digital collection. The subject is a fedora object representing a whole digital collection and the predicate is a fedora object representing an item that is a member of the digital collection. 

<rels:hasCollectionMember>
   a    r:Property;
   s:subPropertyOf
      <rels:hasMember>.

[edit] Derivations

Is Derivation Of
A definition of a generic derivation relationship between fedora objects. The subject is a fedora object that represents a derivation of the predicate which is another fedora object. 

<rels:isDerivationOf>
   a    r:Property;
   s:subPropertyOf
      <rels:fedoraRelationship>.

Has Derivation
A definition of a generic derivation relationship between fedora objects. The subject is a fedora object and the predicate is a fedora object that represents a derivation of the subject. 

<rels:hasDerivation>
   a    r:Property;
   s:subPropertyOf
      <rels:fedoraRelationship>.

[edit] Dependencies

Is Dependent Of
A definition of a generic dependency relationship between fedora objects. The subject is a fedora object that represents a dependent and the predicate is another fedora object that is depended upon by the subject. 

<rels:isDependentOf>
   a    r:Property;
   s:subPropertyOf
      <rels:fedoraRelationship>.

Has Dependent
A definition of a generic dependency relationship between fedora objects. The subject is a fedora object that is depended upon and the predicate is a fedora object that represents a dependent of the subject. 

<rels:hasDependent>
   a    r:Property;
   s:subPropertyOf
      <rels:fedoraRelationship>.

[edit] Descriptions

Is Description Of
A generic descriptive relationship between fedora objects. The subject is a fedora object that represents a descriptive entity and the predicate is a fedora object that is being described in some manner by the subject. 

<rels:isDescriptionOf>
   a    r:Property;
   s:subPropertyOf
      <rels:fedoraRelationship>.

Has Description
A generic descriptive relationship between fedora objects. The subject is a fedora object that is being described in some manner and the predicate is a fedora object that represents a descriptive entity that is about the subject. 

<rels:HasDescription>
   a    r:Property;
   s:subPropertyOf
      <rels:fedoraRelationship>.

[edit] Metadata

Is MetadataFor
A refinement of the generic descriptive relationship indicating a metadata relationship between fedora objects. The subject is a fedora object that represents metadata and the predicate is a fedora object for which the subject serves as metadata. 

<rels:isMetadataFor>
   a    r:Property;
   s:subPropertyOf
      <rels:isDescriptionOf>.

Has Metadata
A refinement of the generic descriptive relationship indicating a metadata relationship between fedora objects. The subject is a fedora object and the predicate is a fedora object that represents metadata about the subject. 

<rels:HasMetadata>
   a    r:Property;
   s:subPropertyOf
      <rels:hasDescription>.

[edit] Annotations

Is Annotation Of
A refinement of the generic descriptive relationship indicating a commentary relationship between fedora objects. The subject is a fedora object that represents an annotation or comment and the predicate is a fedora object that is being commented upon by the subject. 

<rels:isAnnotationOf>
   a    r:Property;
   s:subPropertyOf
      <rels:isDescriptionOf>.

Has Annotation
A refinement of the generic descriptive relationship indicating a commentary relationship between fedora objects. The subject is a fedora object that is being commented on and the predicate is a fedora object that represents an annotation or comment about the subject. 

<rels:HasAnnotation>
   a    r:Property;
   s:subPropertyOf
      <rels:hasDescription>.

[edit] Equivalencies

Has Equivalent
A definition of a generic equivalence relationship between fedora objects. The subject is a fedora object that is equivalent to the predicate which is another fedora objects. 

<rels:hasEquivalent>
   a    r:Property;
   s:subPropertyOf
      <rels:fedoraRelationship>.
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