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Programming in XML the Good, the Bad and the Ugly » re: ...its just plain ugly to express programming constructs in XML.
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Storing code in XML is fine and I agree that viewing is not a problem but how does a programmer write the code?
Some IDE's do this quite nicely - check out how REALbasic from http://www.realsoftware.com/ has a Save as XML that stores the entire project including all the source code as a series of literal lines.