Vocabulary of a Friend (VOAF)¶
The Vocabulary of a Friend (VOAF) is a vocabulary specification providing elements allowing the description of vocabularies, such as RDFS vocabularies or OWL ontologies [1] [2]. It is based on Dublin Core and VoID, and provides a structured vocabulary for representing vocabulary metadata, supporting vocabulary description, discovery, reuse, and management [1] [2].
The ontology employs a class-based modeling approach, defining classes for vocabularies and related vocabulary elements, along with properties to describe their characteristics and relationships [1] [2]. VOAF provides properties for expressing how vocabularies relate to one another, including whether they rely on, extend, specialize, annotate, or otherwise link to other vocabularies [1]. These relationships enable structured retrieval, dependency tracking, and analysis of vocabulary networks [1].
Typical applications of VOAF include vocabulary documentation, vocabulary cataloging, ontology metadata management, linked data vocabulary discovery, vocabulary dependency analysis, and integration of vocabulary descriptions across semantic web platforms [1] [2]. By providing a standardized vocabulary and framework, VOAF enhances interoperability, reuse, and knowledge sharing in the field of vocabulary management [1] [2].
Example Usage: Annotate a vocabulary with VOAF terms to specify its type, metadata, reused vocabularies, extensions, specializations, and relationships to other vocabularies. This enables semantic search, vocabulary discovery, dependency analysis, and integration with vocabulary management platforms [1] [2].
Metrics & Statistics¶
Total Nodes |
175 |
Total Edges |
304 |
Root Nodes |
0 |
Leaf Nodes |
129 |
Classes |
3 |
Individuals |
1 |
Properties |
21 |
Maximum Depth |
0 |
Minimum Depth |
0 |
Average Depth |
0.00 |
Depth Variance |
0.00 |
Maximum Breadth |
0 |
Minimum Breadth |
0 |
Average Breadth |
0.00 |
Breadth Variance |
0.00 |
Term Types |
1 |
Taxonomic Relations |
4 |
Non-taxonomic Relations |
0 |
Average Terms per Type |
1.00 |
Usage Example¶
Use the following code to import this ontology programmatically:
from ontolearner.ontology import VOAF
ontology = VOAF()
ontology.load("path/to/VOAF-ontology.rdf")
# Extract datasets
data = ontology.extract()
# Access specific relations
term_types = data.term_typings
taxonomic_relations = data.type_taxonomies
non_taxonomic_relations = data.type_non_taxonomic_relations