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Home >Online Product Documentation >Table of Contents >Defining Structure Rules in a Sample DTD Defining Structure Rules in a Sample DTDThis topic is part of a sequence that starts with Creating a Sample DTD. To specify the rules for the structure of the book element:
1. Click the book node in the DTD tree if it is not already selected.
2. Click New Modifier 
.
3. In the drop-down list that appears, scroll down and double-click Sequence. This indicates that the book element can include one or more elements.
4. Click New Reference to Element 
.
5. Type title in the entry field and press Enter.
Because the reference to the
6. Click the Sequence modifier.
7. Click New Modifier
.
8. Double-click One or More. (There can be one or more author elements in each book element.)
9. Click New Reference to Element
.
10. Type author in the entry field and press Enter.
At this point, the definition of the
However, you have not yet specified that you want the You can define the bookstore element as follows:
1. Click the DTD node at the top of the tree.
2. Click New Element Definition 
.
3. Type bookstore in the entry field and press Enter.
4. Click New Modifier
.
5. In the drop-down list that Stylus Studio displays, double-click Optional.
6. Click New Reference to Element
.
7. Type book in the entry field and press Enter.
8. Click Save
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XML PRODUCTIVITY THROUGH INNOVATION ™
