General entities look something like:
<!ENTITY NAME "text that you want to be represented by the entity">
which might look like the following in the real world:
<!ENTITY full_name "Diego Ramirez Valenzuela Martinez Perez the 5th">
<!ENTITY license_agreement SYSTEM "http://www.mydomain.com/license.xml">
In this case, the XML processor will replace the entity reference with the contents of the document specified.
