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I assume that the whitespace characters that are disregarded when mode 'x' is specified are the same as XML 1.0 production [3] S. It might be good to reference this rule explicitly. By the way, XML spells it "white space" whereas you spell it "whitespace".
For the record, this comment is in the same area as bug 1922, though it's actually a distinct comment. Some of our specs, regrettably, have adopted the spelling "white space" as used in the base XML spec. Personally, I strongly prefer "whitespace" because the term does not mean "space that is white" (as contrasted with space that is red or green). Michael Kay
The WGs decided on 9/27 to add a sentence to the description of the 'x' flag that says, in effect, that 'whitespace means the four characters x9, xA, xD and x20'.
As XML 1.1 and XML 1.0 3e editor, I tried to weed the term "white space" out of the specs, but the W3C wouldn't have it. Good luck.
Closing bug because commenter has not objected to the resolution posted and more than two weeks have passed.