VS characters, default ignorable property and text search and collation

From: Shriramana Sharma (samjnaa@gmail.com)
Date: Mon Jul 26 2010 - 11:40:21 CDT

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    Hello list.

    I have a question about VS characters and the default ignorable property.

    TUS 5.2 ch 16.4 clearly states that VS characters are default ignorable.
    Ch 5.21 states that default ignorable characters are to be ignored in
    rendering (except in specialized modes which show hidden characters).

    The paragraph in p 171 on default ignorable characters under ch 5.3
    states that "these characters are also ignored except with respect to
    specific, defined processes; for example, zero width non-joiner is
    ignored by default in collation."

    This seems to suggest to me that despite ch 5.21 speaking only about
    rendering, the default ignorable property also has or at least can have
    a part in other processes such as collation. I would however like to
    have a confirmation on this:

    Are all default ignorable characters ignored not only in rendering but
    in other processes also?

    Or is it that they are ignored by default in rendering and whether they
    are ignored in other processes or not is variable?

    Specifically, are VS characters ignored in rendering only (i.e.
    rendering them, not the characters they apply to of course) or are they
    ignored even in other processes such as text search and collation?

    -- 
    Shriramana Sharma
    


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