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Problem :
(a) Show whether or not a standard format for representing data, such as XML, is needed.
(b) Using an appropriate example, describe how data is organized in a data source, such as an XML document.
(c) What is an XML entity? Distinguish between a general entity and a parameter entity. Provide an example of a general entity declaration, followed by a reference to the same entity.
(d) A software company gives technical support service to its customers. A customer will request the service by filing a document. Write a DTD to define the following structure for documents of type DocReq:
1. The request consists of the customer information and the task.
2. Customer information will include the name, address and telephone number.
3. There is a track number related with each request.
4. The task will be urgent or normal, and normal is the default.
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