Computer Science Write an XML DTD which will define the following structure for documents of type exam. An test has a course code, a title and a date, which comprises only the month and year. These are followed by a list of questions. tests consist of either 5 or 6 questions. Each question has one or more part s. Parts of questions can themselves comprise parts along with text. Give an instance of an test document which is valid with respect to your DTD and two instances which are invalid, explaining why they are invalid. Check your answers using an on-line XML validator

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