Two lines are enclosed within a rectangle. the rectangle is placed over a page that has XML written on it. A line connects the rounded rectangle with another rectangle that contains the declaration <!DOCTYPE Messages PUBLIC "http://www.mydomain.com/dtd/messagelist.dtd"> . An arrow starts from the declaration and has the word Link written next to it. The arrow ends at a page that has DTD written on it. The DTD page is placed on the boundary of a cloud graphic that has Internet written on it. On the right of the DTD page, the declaration
http://www.mydomain.com/dtd/messagelist.dtd is shown.