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Introduction to XML For Web Developers
The DOCTYPE Declarations  

If you want to declare entities, you MUST do so within the document DOCTYPE declaration that always follows the prolog (DTD and xml Declaration) and looks like the following:

    <?xml version="1.0"?>
    <!DOCTYPE myDocument [
    ...here is where you declare your entities....
    ]>
    <myDocument>
    ...here is the body of your document....
    </myDocument>

Thus, you might have something like the following (Consider how much easier changing office addresses is when you use entities!):

    <?xml version="1.0"?>
    <!DOCTYPE CLIENTS [
          <!ENTITY ninthFloorAddress "2345 Broadway St Floor 9">
          <!ENTITY eighthFloorAddress "2345 Broadway St Floor 8">
          <!ENTITY seventhFloorAddress "2345 Broadway St Floor 7">
          ]>
    <CLIENTS>
    <CLIENT>
    <NAME>Barnaby Hazen</NAME>
    <ADDRESS>&ninthFloorAddress;</ADDRESS>
    <PHONE>x345</PHONE>
    </CLIENT>

    <CLIENT>
    <NAME>David Florey</NAME>
    <ADDRESS>&ninthFloorAddress;</ADDRESS>
    <PHONE>x111</PHONE>
    </CLIENT>

    <CLIENT>
    <NAME>Danette Ellsworth</NAME>
    <ADDRESS>&ninthFloorAddress;</ADDRESS>
    <PHONE>x346</PHONE>
    </CLIENT>

    <CLIENT>
    <NAME>Rachna Dhamija</NAME>
    <ADDRESS>&seventhFloorAddress;</ADDRESS>
    <PHONE>x289</PHONE>
    </CLIENT>

    <CLIENT>
    <NAME>Kristin Mancuso</NAME>
    <ADDRESS>&eighthFloorAddress;</ADDRESS>
    <PHONE>x945</PHONE>
    </CLIENT>
    </CLIENTS>

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