XML by Example

This declaration is unsafe because it points to a specific application. The

application might not be available on another computer or it might be

available but from another path. If your system has defined the appropriate

file associations, you can get away with a declaration such as

<!NOTATION GIF89a SYSTEM “GIF”>

<!NOTATION GIF89a SYSTEM “image/gif”>

The first notation uses the filename, while the second uses the MIME type.

Managing Documents with Entities

External entities are helpful to modularize and help manage large DTDs

and large document sets.

The idea is very simple: Try to divide your work into smaller pieces that are

more manageable. Save ...