Specifying That An Element Can Contain One of a Group of Elements in DTDs

You might want to define an element that contains one element out of a group of elements. For example, you might want an InventoryNumber element to contain a book, magazine, or newsletter element.

In the Tree tab, to define an element that contains one of a group of elements:

After you add a reference to an element, you might want to check the definition of the referenced element. To do this, right-click the reference. In the shortcut menu, click Go To Definition. Stylus Studio moves the focus to the definition of the referenced element.

When the XSLT processor validates an instance document against this DTD, it ensures that each instance of the new element you just defined contains exactly one of the referenced elements.

The tree representation for an InventoryNumber element that can contain a book, magazine, or newsletter element would look like the following:

InventoryNumber 
Choice 
book 
magazine 
newsletter