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Understanding XML spec on accepted characters

 
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I am currently reading the XML 1.0 spec and do not
understand the section where it lists the allowed
characters.


Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
/* any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. */


Since unicode is a 16bit value; isn't #x10000-#x10FFFF invalid
as they are 20 and 24 bit values ? Or are they related to the
surrogate blocks ?
Thanks all!
Pho
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