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1) What are the differences between structured, semistructured, and unstructured data? Under which of the categories do XML documents fall? 2) What is the difference

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1) What are the differences between structured, semistructured, and unstructured data? Under which of the categories do XML documents fall? 2) What is the difference between attributes and elements in XML? 3) List some of the important attributes used to specify elements in XML schema. 4) What is the difference between XML schema and XML DTD

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