About Ontologies

Ontologies are available in these tabs:

  • Favorites: your favorite ontologies
  • My ontologies: the ontologies you own only as main owner
  • All ontologies: the ontologies you own

This page discusses:

Ontology access

Both loaded and not yet loaded ontologies appear in Ontology Editor. The ontologies displayed with this icon are loaded and available to you.

To access another ontology, click on it. This icon then appears to inform you that it is available to you.

You can use the breadcrumbs to navigate.

Ontologies information

An Ontology has several information available in its tab that can be managed and edited. You can navigate between the tabs of a selected ontology (Description, SKOS Thesaurus (Concepts, Concept Schemes, Collections), Classes, Properties, Individuals, Script View, Graph View).

Description

The description tab has the following elements:

  • Label: human-readable name of the Ontology
  • Comment: any comment or description
  • Prefix: short URI of the Ontology
  • URI: Ontology URI
  • Version: a string that provides information about the version of the Ontology
  • Prerequisites: a list of the ontologies that are prerequisites for this Ontology
  • Thesaurus: turn on this option if the created ontology is a SKOS Thesaurus.
  • >More: you can choose to display additional properties other than built-in ones (RDF properties only)
Note:
  • Language-specific properties such as Label or Comment depend on the language you selected in your Preferences.
  • Any value you enter into a lang-specific property field is set for the preferred language only.

Classes

You can explore classes by using the Grid-Tree view that displays classes hierarchy or by using the tile view that displays them listed.

Each class has a Description and a Graph View.

A class description tab has the following elements:

  • Label: human-readable name of the class
  • Comment: any comment or description
  • URI: URI of the class
  • Type: class type (rdfs:Class or owl:Class)
  • Sub Class of: parent classes
  • Equivalent to: equivalent classes (if the class is of owl:class type)
  • Disjoint with: disjoint classes (if the class is of owl:class type)
  • >More : you can choose to display additional properties other than built-in ones (RDF properties only)

Properties

You can explore properties by using the Grid-Tree view that displays properties hierarchy or by using the tile view that displays them listed.

Each property has a Description and a Graph View.

A property description tab has the following elements:

  • Label: human-readable name of the property
  • Comment: any comment or description
  • URI: URI of the property
  • Type: property type (rdf:Property, owl:DatatypeProperty or owl:ObjectProperty)
  • Sub Property Of: parent properties
  • Equivalent to: equivalent properties (If the property is of type Datatype or Object property)
  • Domain: defines the class of subjects related to a property
  • Range: defines the class or data type of the property values
  • >More: you can choose to display additional properties other than built-in ones (RDF properties only)

Individuals

Each individual has a Description.

The description tab has the following elements:

  • Label: human-readable name of the individual
  • Comment: any comment or description
  • URI: URI of the individual
  • Type: class type (rdfs:Class or owl:Class).
    Note: If not filled, the type of the individual will be set to rdfs:Resource.
  • Same As: one or more individuals that refer to the same context as this individual
  • Different From: one or more individuals that do not refer to the same context as this individual
  • >More: you can choose to display additional properties other than built-in ones

(RDF, Object, Datatype properties)

Concepts (SKOS Thesaurus)

You can explore concepts by using the Grid-Tree view that displays concepts hierarchy or by using the tile view that displays them listed.

Each concept has a Description and a Graph View.

A SKOS concept description tab has the following elements:

  • Preferred label: human-readable name of the concept
  • Definition: any definition or description
  • URI: URI of the concept
  • Type: class type (rdfs:Class or owl:Class).
    Note: the "Concept" type cannot be removed.
  • Broader: one or more concepts that are broader relationships than this concept.
  • Narrower: one or more concepts that are narrower relationships than this concept.
  • Scheme: one or more concepts schemes
  • Alternative label: human-readable name of the concept
  • Close match: one or more concepts that are close relationships than this concept.
  • Exact match: one or more concepts that are exact relationships than this concept.
  • >More: you can choose to display additional properties other than built-in ones (RDF, Object, Datatype properties)

In graph view tab, the concept is displayed along with its direct broader and narrower concepts.

Concept schemes (SKOS Thesaurus)

Each concept scheme has a Description.

A concept scheme description tab has the following elements:

  • Preferred label: human-readable name of the concept scheme
  • Definition: any definition or description
  • URI: URI of the concept scheme
  • Type: class type (rdfs:Class or owl:Class)
    Note: the "Concept Scheme" type cannot be removed.
  • Top concept: one or more concepts that are top concept relationships
  • >More: you can choose to display additional properties other than built-in ones (RDF, Object, Datatype properties)

Collections (SKOS Thesaurus)

Each collection has a Description.

The description tab has the following elements:

  • Preferred label: human-readable name of the collection
  • Definition: any definition or description
  • URI: URI of the collection
  • Type: class type (rdfs:Class or owl:Class)
    Note: the "Collection" type cannot be removed.
  • Member: one or more concepts that are member relationships
  • >More: you can choose to display additional properties other than built-in ones (RDF, Object, Datatype properties)

Script View

The Script View is provided for Turtle (Ttl) (default) or RDF/XML formats.

Note: RDF/XML format is available for up to 5000 triples.

Graph View

Click to select a view and display the following graphs:

  • Ontology: Ontology prerequisites (use of existing ontologies)
  • Classes: Classes Taxonomy (shows the taxonomy of classes based on rdfs:subClassOf relationship)
  • Properties: Properties taxonomy (shows the taxonomy of properties based on rdfs:subPropertyOf relationship)

For Classes and Properties, click Tree Layout or Springs layout.

Click Manipulate Graph (for Classes and Properties) to:

  • Fit Graph in frame
  • Expand all
  • Collapse all
  • Expand next level (only displays one level)

Note:
  • For the Tree Layout, Expand all and Expand next level are deactivated if the classes / properties count exceeds 1200 elements.
  • Springs Layout is deactivated if the classes/properties count exceeds 200 elements

Click to display the legend of a graph.