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faceted metadata, Seamark
Feature Synopsis for OWL
find method, RDF API for PHP
findRegex method, RDF API for PHP
findVocabulary method, RDF API for PHP
FOAF (Friend-of-a-Friend)
FOAF-A-Matic
FOAFBot
FOAFCorp project
format element, RSS Content module
4RDF, Python-based RDF API
Fourthought 4RDF
frameworks [See also APIs]
Redfoot
Redland
Friend-of-a-Friend [See FOAF]