Defining Data Elements in a Sample DTD

In your DTD, suppose you want a book element to be optional. Further, if a book element is present, it must always have exactly one title element and it can have any number of author elements. The title and author elements contain only raw data.

To accomplish this, perform the following steps:

Stylus Studio displays an entry field for the element name.

Stylus Studio displays the new element, title, and the element's properties in the Properties window.

Stylus Studio displays an entry field for the element's modifier.

The new modifier is added to the element.

When you are done, the Stylus Studio desktop should resemble the following:

Figure 46. Creating a DTD with Two Elements

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