Shapes Constraint Language
Language for validating RDF graphs against conditions (shapes). W3C standard for data quality.
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Where this one tends to earn its keep.
Validate RDF data quality automatically
Define and enforce graph data constraints
Data governance for knowledge graphs
Generate forms from shape definitions
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Web Standards.