ISO 8601 reference:ISO 2008-12-16 Valid SMPTE 12M (Timecode) reference:SMPTE 2008-12-16 Valid SMPTE 12M (Timecode) with drop frames reference:SMPTE 2008-12-16 Valid Edit Unit Fraction of a second inversely proportional to the video frame rate or audio sample rate reference: 2008-12-16 Valid Second reference: 2008-12-16 Valid Millisecond reference: Spelling mistake corrected 2009-01-06 Valid RFC 3339 Date and time over the Internet, Note that RFC 3339 is stricter than ISO 8601 and will require that each element is present for the definition of data AND time e.g. when expressing only a date or time within an element or attribute of dateTime type reference:IETF 2008-12-16 Valid Normal Play Time Time specification conforming to section 3.6 of RFC 2326 (Normal Play Time). Syntax: hh:mm:ss.mmm (precision: millisecond) reference:IETF Added for harmonisation with IPTC for use e.g. in NewsML-G2 2009-02-04 Valid