just adding notes to .xml files

[Johnny|lucidcomposure]

This is probably the dumbest question you'll come accross all week but in my .xml files how can I make a note that wont affect the xml file but is just something there for me as help when editing the file.

 

[marc2003]

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http://www.w3schools.com/xml/xml_syntax.asp

 

[Johnny|lucidcomposure]

Cheers