http://www.w3.org/2004/02/skos/core#narrower

used by 20:

• apr-register-of-regional-development-measures-and-incentives
• a-z-of-terms-dfe
• courts-thesaurus
• english-heritage-event-types-thesaurus
• english-heritage-evidence-thesaurus
• hellenic-fire-brigade
• iris2
• jel-classification
• lcsh
• msc
• nalt
• nvs
• oreilly
• regional-development-measures-and-incentives-data-8-and-data-11
• rzs-register-of-teritorial-units
• southampton-ac-uk-jacs
• taxonconcept
• thesaurus-bncf
• wikipedia3
• ysa