http://www.w3.org/1999/02/22-rdf-syntax-ns#_5

used by 16:

• aspire-harper-adams
• aspire-keele
• aspire-mmu
• aspire-ntu
• aspire-roehampton
• aspire-st-andrews
• aspire-sussex
• aspire-ucl
• bibsonomy
• hebis-bibliographic-resources
• indymedia
• jugem
• paliano
• pontecorvo-chiese-ed-oratori
• rkb-explorer-webconf
• wordpress