Real World XML

Comments

XML comments are very much like HTML comments. You can use comments to include explanatory notes in your document that are ignored by XML parsers; comments may appear anywhere in a document outside other markup. As in HTML, you start a comment with <!-- and end it with -->. Here's an example:

<?xml version="1.0" encoding="UTF-8"?> 
<DOCUMENT>
    <!--Start the document off with a greeting.-->
					<GREETING>
					<!--Here's the greeting's text.-->
        Hello from XML!
    </GREETING>
</DOCUMENT>

You should follow a few rules when adding comments to an XML document:

Comments must not come before an XML declaration. For example, this is incorrect:

					<!--Here's my document.--> <?xml version="1.0" encoding="UTF-8"?> <DOCUMENT> <GREETING> Hello from XML! </GREETING> ...