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Re: unitless lengths in mpadded attributes

From: David Carlisle <davidc@nag.co.uk>
Date: Wed, 23 May 2012 09:27:58 +0100
Message-ID: <4FBC9F8E.8070300@nag.co.uk>
To: Frédéric WANG <fred.wang@free.fr>
Cc: www-math@w3.org, w3@karlt.net

Thanks for your comments, I think this shows the advantages of moving
the editors' draft to public space in that people can see exactly what
changes are proposed earlier and comment if necessary:-)

As you know MathML2 wasn't always consistent in this area and
maintaining compatibility with MathML2 in "real" cases but moving
towards a more consistent treatment of lengths in mathml3 has proved tricky.

The basic "model" for lengths in mathml3 is that in most cases units may
be omitted and in that case the number is taken as a multiplier for the
specified default value. That would suggest the interpretation that we
put in the draft yesterday that unitless lengths _are_ allowed. However
you make some good points and clearly we should look again before
definitely confirming this.

If any other implementors could say whether they currently allow
unitless values on mpadded, and if so whether they just allow 0 or other
non-zero values, that would also be useful information.


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