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Triples in the Resource Index

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The resource index stores system and user-controlled metadata about each object in the repository in the form of RDF triples. The number and type of triples stored depends on the content of the object. This document describes the triples that may exist in the resource index for a given object. The color of each row indicates how many of each kind of RDF triple can be expected. See the key on the right.

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Cardinality Key

Table Row (tr)

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Zero or more

Table Row (tr)

Table Cell (td)

bgcolor	#87CEFA
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Zero or one

Table Row (tr)

Table Cell (td)

bgcolor	#90EE90
align	center

Exactly one

Table Row (tr)

Table Cell (td)

bgcolor	#FFCC99
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One or more

Namespaces Used

For brevity, the URIs used in this document are shown in abbreviated form. To determine the unabbreviated form of any such URI, replace the Prefix with the associated Namespace URI below.

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Prefix

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Namespace URI

Table Row (tr)

Table Cell (td)
dc:

Table Cell (td)
http://purl.org/dc/elements/1.1/

Table Row (tr)

Table Cell (td)
fedora-model:

Table Cell (td)
info:fedora/fedora-system:def/model#

Table Row (tr)

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fedora-view:

Table Cell (td)
info:fedora/fedora-system:def/view#

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rdf:

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http://www.w3.org/1999/02/22-rdf-syntax-ns#

Breakdown

Base Triples

The following triples will exist for any object, irrespective of its Datastream content.

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Table Row (tr)

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Table Cell (td)
Subject

Table Cell (td)
Predicate

Table Cell (td)
Object

Table Cell (td)
Cardinality

Table Row (tr)

bgcolor	#90EE90

Table Cell (td)

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info:fedora/$PID

Table Cell (td)
fedora-model:createdDate

Table Cell (td)
(date created in UTC)

Table Cell (td)
Exactly One

Table Row (tr)

bgcolor	#90EE90

Table Cell (td)

valign	top

info:fedora/$PID

Table Cell (td)

valign	top

fedora-view:lastModifiedDate

Table Cell (td)

valign	top

(date modified in UTC)

Table Cell (td)

valign	top

Exactly One

Table Row (tr)

bgcolor	#90EE90

Table Cell (td)

valign	top

info:fedora/$PID

Table Cell (td)

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fedora-model:state

Table Cell (td)

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fedora-model:Active
fedora-model:Inactive
fedora-model:Deleted

Table Cell (td)

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Exactly One

Table Row (tr)

bgcolor	#90EE90

Table Cell (td)

valign	top

info:fedora/$PID

Table Cell (td)

valign	top

fedora-model:owner

Table Cell (td)

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(not used)

Table Cell (td)

valign	top

Exactly One

Table Row (tr)

bgcolor	#90EE90

Table Cell (td)

valign	top

info:fedora/$PID

Table Cell (td)

valign	top

fedora-model:label

Table Cell (td)

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(any string)

Table Cell (td)

valign	top

Exactly One

Dublin Core Triples

Every object in Fedora has a Dublin Core ("DC") Datastream. The following triples are derived from its content, which may consist of any number of each of the 15 unqualified Dublin Core elements. If unprovided at ingest, the DC Datastream will be automatically created with minimal information (a dc:title and a dc:identifier).

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Table Row (tr)

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Table Cell (td)
Subject

Table Cell (td)
Predicate

Table Cell (td)
Object

Table Cell (td)
Cardinality

Table Row (tr)

bgcolor	#FFCC99

Table Cell (td)
info:fedora/$PID

Table Cell (td)
dc:title

Table Cell (td)
(any string)

Table Cell (td)
One or More

Table Row (tr)

bgcolor	#FFCC99

Table Cell (td)
info:fedora/$PID

Table Cell (td)
dc:identifier

Table Cell (td)
(any string)

Table Cell (td)
One or More

Table Row (tr)

bgcolor	#ffff00

Table Cell (td)
info:fedora/$PID

Table Cell (td)
(any other dc predicate)

Table Cell (td)
(any string)

Table Cell (td)
Zero or More

RELS-EXT and RELS-INT Triples

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Table Row (tr)

bgcolor	#c0c0c0
align	center

Table Cell (td)
Subject

Table Cell (td)
Predicate

Table Cell (td)
Object

Table Cell (td)
Cardinality

Table Row (tr)

bgcolor	#ffff00

Table Cell (td)
info:fedora/$PID

Table Cell (td)
(any non-reserved predicate)

Table Cell (td)
(any URI or literal)

Table Cell (td)
Zero or More

Content Model Architecture Triples

Note: If not explicitly provided the Fedora Repository will assume there is a fedora-model:hasModel relation asserted from a Data Object to a system-supplied base CModel Object satisfying the cardinality constraint. This relation should be explicitly stated in the REL-EXT Datastream as a recommended practice. Also note that, while CModel, SDef, and SDep objects may be created without asserting their respective relations, they will not perform their functions without them.

Note: In Fedora 3.0, though permitted, it is not recommended that one SDep object be used to deploy a service for more than one CModel-SDef pair. Future versions of Fedora are likely to provide better support for this configuration.

HTML Table

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Table Row (tr)

bgcolor	#c0c0c0
align	center

Table Cell (td)
Subject

Table Cell (td)
Predicate

Table Cell (td)
Object

Table Cell (td)
Cardinality

Table Row (tr)

bgcolor	#FFCC99

Table Cell (td)
info:fedora/$PID

Table Cell (td)
fedora-model:hasModel

Table Cell (td)
info:fedora/$CMODEL_PID

Table Cell (td)
One or More

Table Row (tr)

bgcolor	#ffff00

Table Cell (td)
info:fedora/$CMODEL_PID

Table Cell (td)
fedora-model:hasService

Table Cell (td)
info:fedora/$SDEF_PID

Table Cell (td)
Zero or More

Table Row (tr)

bgcolor	#ffff00

Table Cell (td)
info:fedora/$SDEP_PID

Table Cell (td)
fedora-model:isDeploymentOf

Table Cell (td)
info:fedora/$SDEF_PID

Table Cell (td)
Zero or More

Table Row (tr)

bgcolor	#ffff00

Table Cell (td)
info:fedora/$SDEP_PID

Table Cell (td)
fedora-model:isContractorOf

Table Cell (td)
info:fedora/$CMODEL_PID

Table Cell (td)
Zero or More

Datastream Triples

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Table Row (tr)

bgcolor	#c0c0c0
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Table Cell (td)
Subject

Table Cell (td)
Predicate

Table Cell (td)
Object

Table Cell (td)
Cardinality

Table Row (tr)

bgcolor	#90EE90

Table Cell (td)

valign	top

info:fedora/$PID

Table Cell (td)

valign	top

fedora-view:disseminates

Table Cell (td)

valign	top

info:fedora/$PID/$DSID

Table Cell (td)

valign	top

Exactly One

Table Row (tr)

bgcolor	#90EE90

Table Cell (td)

valign	top

info:fedora/$PID/$DSID

Table Cell (td)

valign	top

fedora-view:disseminationType

Table Cell (td)

valign	top

info:fedora/*/$DSID

Table Cell (td)

valign	top

Exactly One

Table Row (tr)

bgcolor	#90EE90

Table Cell (td)

valign	top

info:fedora/$PID/$DSID

Table Cell (td)

valign	top

fedora-view:mimeType

Table Cell (td)

valign	top

(any mime type string)

Table Cell (td)

valign	top

Exactly One

Table Row (tr)

bgcolor	#90EE90

Table Cell (td)

valign	top

info:fedora/$PID/$DSID

Table Cell (td)

valign	top

fedora-view:lastModifiedDate

Table Cell (td)

valign	top

(date modified in UTC)

Table Cell (td)

valign	top

Exactly One

Table Row (tr)

bgcolor	#90EE90

Table Cell (td)

valign	top

info:fedora/$PID/$DSID

Table Cell (td)

valign	top

fedora-model:state

Table Cell (td)

valign	top

fedora-model:Active
fedora-model:Inactive
fedora-model:Deleted

Table Cell (td)

valign	top

Exactly One

Table Row (tr)

bgcolor	#90EE90

Table Cell (td)

valign	top

info:fedora/$PID/$DSID

Table Cell (td)

valign	top

fedora-view:isVolatile

Table Cell (td)

valign	top

(true if R or E, false if M or X)

Table Cell (td)

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Exactly One

Calculating Triples/Object

You can use the following table to estimate the number of triples for each kind of object in your Fedora repository.

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Calculation Method

Table Cell (td)
# Triples

Table Row (tr)

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Table Cell (td)

Every object automatically gets the following triples:

Base: 6
Dublin Core (dc:title and dc:identifier): 2
Content Model Architecture (fedora-model:hasContentModel): 1
Datastream Triples (for DC): 6

Table Cell (td)

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15

Table Row (tr)

bgcolor	#ffffff

Table Cell (td)
If the DC datastream has any elements besides the standard dc:title and dc:identifier, add 1 for each additional element.

Table Cell (td)

Table Row (tr)

bgcolor	#ffffff

Table Cell (td)
If the object has a RELS-EXT and/or a RELS-INT datastream, add 7, then add 1 for each statement asserted therein (except fedora-model:hasContentModel which has been counted above).

Table Cell (td)

Table Row (tr)

bgcolor	#ffffff

Table Cell (td)
For each additional datastream, add 7.

Table Cell (td)

Versions Compared

Old Version 4

New Version Current

Key

Triples in the Resource Index

Namespaces Used

Breakdown

Base Triples

Dublin Core Triples

RELS-EXT and RELS-INT Triples

Content Model Architecture Triples

Datastream Triples

Calculating Triples/Object