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Assess the quality of SKOS or SKOS-XL vocabularies

SKOS data

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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 !
Looking for a test file ? here is a list of continents. You can also create SKOS from Excel using the SKOS Play converter.


Rules

anr
Ambiguous Notation References
Finds concepts with multiple or identical notations within the same concept scheme.
bl
Broken Links
Broken links.
chr
Cyclic Hierarchical Relations
Finds concepts that are hierarchically related to each other.
dcc
Disconnected Concept Clusters
Finds sets of concepts that are isolated from the rest of the vocabulary.
dlv
Disjoint Labels Violation
Finds resources with identical entries for different label types.
el
Empty Labels
Finds empty labels or labels containing only whitespaces.
hr
Hierarchical Redundancy
Finds broader/narrower relations over multiple hierarchy levels.
husv
HTTP URI Scheme Violation
Finds triple subjects that are no HTTP URIs.
ilc
Incomplete Language Coverage
Finds concepts lacking description in languages that are present for other concepts.
ipl
Inconsistent Preferred Labels
Finds resources with more then one prefLabel per language.
ml
Missing Labels
Finds concepts and conceptSchemes with missing labels.
mol
Missing Out-Link
Finds concepts that are not linked to other vocabularies on the Web.
mri
Mapping Relations Misuse
Finds concepts within the same concept scheme that are related by a mapping relation.
ncl
No Common Languages
Checks for common languages in all concept literals.
oc
Orphan Concepts
Finds all orphan concepts, i.e. those not having semantic relationships to other concepts.
oilt
Omitted or Invalid Language Tags
Finds omitted or invalid language tags of text literals.
ol
Overlapping Labels
Finds concepts with similar (identical) labels.
otc
Omitted Top Concepts
Finds skos:ConceptSchemes that don't have top concepts defined.
rc
Relation Clashes
Covers condition S27 from the SKOS reference document (Associative vs. Hierarchical Relation Clashes).
rrc
Reflexively Related Concepts
Finds concepts that are related to themselves.
strc
Solely Transitively Related Concepts
Concepts only related by skos:broaderTransitive or skos:narrowerTransitive.
tchbc
Top Concepts Having Broader Concepts
Finds top concepts internal to the vocabulary hierarchy tree.
uc
Undocumented Concepts
Finds concepts that don't use any SKOS documentation properties.
ucil
Unprintable Characters in Labels
Finds concepts having labels that contain unprintable characters.
urc
Unidirectionally Related Concepts
Concepts not including reciprocal relations
usr
Undefined SKOS Resources
Finds 'invented' new terms within the SKOS namespace or deprecated properties.
var
Valueless Associative Relations
Finds sibling concept pairs that are also connected by an associative relation.