The following checklist outlines the steps you can take to create a DTD from an existing set of tags:

1. Determine the root element for the document.
2. List all the other elements used in the document.
3. Create the document tree structure for these elements.
4. Note whether elements need to appear in a specific order.
5. Note whether certain elements have content that must be present, can be present, or may be present multiple times.
6. Note which elements will contain text, which will only contain other elements, and which may contain both.

Click the Exercise button to create a DTD.
DTD Checklist - Exercise