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:

1. Define the elements that your new element can contain. See Defining Elements in DTDs.

2. Define the element that you want to contain another element. This is the container element.

3. Click the container element name.

4. In the left tool bar, click New Modifier

. Stylus Studio displays a drop-down menu.

5. Double-click Choice.

6. For each element in the group of elements from which one element can appear:

a. Click New Reference to Element

in the left tool bar.

b. Type the name of the element and press Enter.

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

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

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

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