[SVG Tiny 1.2 CR Comment] spec text of rendering hints is confusing to implementors

The spec text of shape-rendering, text-rendering, image-rendering and 
color-rendering uses repeatedly the word "shall" in the context of 
something called "hints".
This caused our developers to question my statement that although the 
parsing of these attributes is mandatory, the implementation of these 
attributes is optional.
Please clarify the specification. Suggested action is to replace all 
instances of "shall" by "should" or "may" in the hints semantics.
Best regards
JC
-- 
*Jean-Claude Dufourd* - Chief Scientist, *Streamezzo*
83, Bd du Montparnasse 75006 Paris - Tel: +33 (0) 153632847
*http://www.streamezzo.com* - Fax: +33 (0) 142224601