Specifying That an Element is Optional in DTDs

In the Tree tab, to specify that an element is optional:

2. Create the element that contains the element that you want to be optional. This is the container element.

3. Click the container element name.

4. In the tool bar on the left, click New Modifier . Stylus Studio displays a drop-down menu.

5. If the container element can contain only the optional element, skip this step. If the container element can contain more than one element, click Sequence.

6. Click New Modifier.

7. In the pop-up menu that appears, double-click Optional.

8. In the tool bar on the left, click New Reference to Element and enter the name of the optional element. If the container element can contain additional optional elements, repeat this step for each one.

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.