SKOS testing tool
Assess the quality of
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Supported extensions : .rdf, .ttl, .nt, .n3, .trig, .trix. Other extensions will be interpreted as RDF/XML. Don't use the ".skos" extension !
... or give the URL of a SKOS file
Looking for a test file ? here is a
list of continents
. You can also create SKOS from Excel using the
SKOS Play converter
dqv in rdf/xml
dqv in ttl
Ambiguous Notation References
Finds concepts with multiple or identical notations within the same concept scheme.
Cyclic Hierarchical Relations
Finds concepts that are hierarchically related to each other.
Disconnected Concept Clusters
Finds sets of concepts that are isolated from the rest of the vocabulary.
Disjoint Labels Violation
Finds resources with identical entries for different label types.
Finds empty labels or labels containing only whitespaces.
Finds broader/narrower relations over multiple hierarchy levels.
HTTP URI Scheme Violation
Finds triple subjects that are no HTTP URIs.
Incomplete Language Coverage
Finds concepts lacking description in languages that are present for other concepts.
Inconsistent Preferred Labels
Finds resources with more then one prefLabel per language.
Finds concepts and conceptSchemes with missing labels.
Finds concepts that are not linked to other vocabularies on the Web.
Mapping Relations Misuse
Finds concepts within the same concept scheme that are related by a mapping relation.
No Common Languages
Checks for common languages in all concept literals.
Finds all orphan concepts, i.e. those not having semantic relationships to other concepts.
Omitted or Invalid Language Tags
Finds omitted or invalid language tags of text literals.
Finds concepts with similar (identical) labels.
Omitted Top Concepts
Finds skos:ConceptSchemes that don't have top concepts defined.
Covers condition S27 from the SKOS reference document (Associative vs. Hierarchical Relation Clashes).
Reflexively Related Concepts
Finds concepts that are related to themselves.
Solely Transitively Related Concepts
Concepts only related by skos:broaderTransitive or skos:narrowerTransitive.
Top Concepts Having Broader Concepts
Finds top concepts internal to the vocabulary hierarchy tree.
Finds concepts that don't use any SKOS documentation properties.
Unprintable Characters in Labels
Finds concepts having labels that contain unprintable characters.
Unidirectionally Related Concepts
Concepts not including reciprocal relations
Undefined SKOS Resources
Finds 'invented' new terms within the SKOS namespace or deprecated properties.
Valueless Associative Relations
Finds sibling concept pairs that are also connected by an associative relation.