ISSUE-122: consistency of ratio/resolution/origin/extent syntax [DFXP 1.0]

ISSUE-122: consistency of ratio/resolution/origin/extent syntax [DFXP 1.0]

http://www.w3.org/AudioVideo/TT/tracker/issues/122

Raised by: Glenn Adams
On product: DFXP 1.0

at present, ttp:cellResolution, ttp:frameRateMultiplier, ttp:pixelAspectRatio, tts:origin, and tts:extent express a ratio, a point (two coordinates), or a rectilinear area (two lengths) using varying syntax as follows:

ttp:cellResolution           : columns rows
ttp:frameRateMultiplier : numerator ( ':' denominator )?
ttp:pixelAspecRatio        : width ':' height
tts:origin                          : <length> <length>
tts:extent                         : <length> <length>

i propose that the syntax of these be more unified, and, in particular, that the ':' separator used in ttp:frameRateMultiplier and ttp:pixelAspectRatio be eliminated (using whitespace instead), and that the denominator be required on frameRateMultiplier;

with this minor change, all of these expressions will consist of two required terms separated by a whitespace separator