[Petal] Attributes with dashes

[Olaf Buwen]

Hi,

in one of my projects, I found that
"tal:attributes='foo-bar data/foo/bar'" does not work, although XML 
allows attributes with dashes.

As a workaround, I modified the regular expression in
Petal/Canonicalizer/XML.pm, line 547 from
     /^\s*((?:\w|\:)+)\s+(.*?)\s*$/
to
     /^\s*((?:[-\w]|\:)+)\s+(.*?)\s*$/
so that dashes now are recognized.

Is there any interest for this patch to be included in the next release?

Regards