DTD

DTD

DTD is a core part of XML. In this case file you'll learn what it is, why it matters, and how to use it in real code.

Understanding dtd well means you can read other people's XML code with confidence, and avoid the most common beginner mistakes in this area.

Key points:

• What dtd means in the context of XML
• A minimal example you can run or read in the playground on the right
• A common mistake to avoid when working with dtd

<!-- XML: DTD -->
<case-file>
  <topic>XML</topic>
  <chapter>DTD</chapter>
</case-file>

Tip: Try changing a value in the code on the right and re-running it — small experiments are the fastest way to build real intuition for dtd.