Task 6

(Your answer to each of the following questions should be at least ONE page, excluding examples.)

1. Discuss the roles of entities in XML, giving examples what problems can occur when they are not used properly.
2. Review the correct use of character sets in XML, discussing the advantages and disadvantages of different sets, with examples. How would you select your character sets to present Chinese characters? 
3. Describe and discuss the logical modelling of data in the context of XML, giving examples. 
4. What is the role of namespaces in XML? What benefits does the use of namespaces confer and what problems may be avoided? Give brief examples to illustrate your answers 
5. What is Xpath and what does it do? Evaluate the strengths and weaknesses of this concept, with examples.