Why Hex character like Hex04 are not suppoted by XML/X

Hi All,
	
	I know that Hexadecimal characters are not supported by XML
Specification.
It actually results in lots and lots of practical problems, like if I want
to pass rawdata
which has hexa-decimal characters in it as part of xml element. 
I will have to encode all the rawdata string and decode
it back after parsing which is a performace hit. Does any body know why xml
does not
support these hexa-decimal characters. Could you guys also suggest me the
best
solution to handle this situation..

Thanks A Lot

Raj..

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