http://www.w3.org/2000/01/rdf-schema#subPropertyOf

used by 19:

• aksworg
• data-gov-uk-time-intervals
• event-media
• fao-geopolitical-ontology
• geospecies
• global-hunger-index
• global-hunger-index-2011
• gold
• hellenic-fire-brigade
• higher-education-reference-ontology
• iris2
• lexinfo
• lime
• meducator
• reference-data-gov-uk
• rend_demo
• semantic_bible
• taxonconcept
• vivo-cu-boulder