Question:

(a) "XML is about the structure of data; this is what makes it so much more powerful than HTML which is about the presentation of data." Show this statement.

(b) (i) Explain the characteristics of a well-formed XML document.
(ii) Give four uses of DTDs.

(c) Describe the three types of Compositors used within the W3C XML Schema language that handle the order of individual elements.

(d) Write a DTD to define the subsequent structure for documents of type Exam:

1. An exam has a course code, a title and a date, which comprises only the month and year
2. These are followed by a list of questions
3. Exams consist of either 5 or 6 questions
4. Each question has one or more parts
5. Parts of questions can themselves comprise parts along with text.