What does it mean to "not be a valid string in Unicode"?

From: Costello, Roger L. <costello_at_mitre.org>
Date: Fri, 4 Jan 2013 22:08:10 +0000

Hi Folks,

In the book, Fonts & Encodings (p. 61, first paragraph) it says:

    ... we select a substring that begins
    with a combining character, this new
    string will not be a valid string in
     Unicode.

What does it mean to not be a valid string in Unicode?

/Roger
Received on Fri Jan 04 2013 - 16:11:35 CST

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