The Rio turtle parser and writer are currently based on the 2006 version of the Turtle format as defined by Dave Beckett (see http://www.dajobe.org/2004/01/turtle/ ). However, W3C is officially standardizing Turtle, currently it's a working draft (see http://www.w3.org/TR/turtle/ ). Our Turtle parser should be updated to reflect this updated spec. A partial was already done to address one specific incompatibility (see ), but we need to review the spec and the parser/writer in more detail to flush out any incompatibilities.