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>