Write a short answer to each of the following questions.

1. What makes an XML document well-formed? Is every well-formed document valid? Why? Is every valid document well-formed? Why?


2. Are there constraints that can be expressed using XML Schema but not DTD? Provide examples.


3. Define XML tags for describing your car and your friends’ cars using these tags. Think about what properties should be defined as attributes and what properties are best described as elements. Make sure your documents are well-formed.