thoughts on 4.2.1

I accessed Webster's Pocket Thesaurus for the English Language, and 
synonyms for "equivalent" are: "match", "rival", "equal", "like", 
"replacement". Synonyms for "version" are: "interpretation", "rendition", 
and synonyms for "alternative" are "substitute", "selection", "option", 
"choice", "replacement", "possibility".

How about "alternative", or "equivalent alternative"? By the way, the 
Authoring Tools Accessibility Guidelines (ATAG2.0) [1] defines "equivalent 
alternative" for its purposes as:

"An equivalent alternative is content that is an acceptable substitute for 
other content that a person may not be able to access. An equivalent 
alternative fulfills essentially the same function or purpose as the 
original content upon presentation. Equivalent alternatives include text 
alternatives and synchronized alternatives. Text alternatives present a 
text version of the information conveyed in non-text objects such as 
graphics and audio clips. The text alternative is considered accessible 
because it can be rendered in many different ways (e.g., as synthesized 
speech for individuals who have visual or learning disabilities, as Braille 
for individuals who are blind, as graphical text for individuals who are 
deaf or do not have a disability). Accessible multimedia alternatives 
present the same information as is conveyed in the multimedia via 
accessible text, navigation, forms, etc.. Synchronized alternatives present 
essential audio information visually (i.e., captions) and essential video 
information in an auditory manner (i.e., audio descriptions). "




Is any of this helpful?

Thanks and best wishes
Tim Boland NIST




[1]: 
http://www.w3.org/WAI/AU/2006/WD-ATAG20-20060629/WD-ATAG20-20060629.html#definitions


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Tim, do you have suggestions for something that is less overloaded than 
version ?


Loretta