eXchangable Faceted Metadata Language (XFML) - "an XML language for sharing hierarchical faceted metadata and indexing efforts." which seems to have come out of TM community but also claims RDF compatibility.
eXchangable Faceted Metadata Language (XFML) - "an XML language for sharing hierarchical faceted metadata and indexing efforts." which seems to have come out of TM community but also claims RDF compatibility.