XML Document Howto?

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Okay so I need some help to turn a excel document into a XML Document. The normal excel document has several columns along the top with various headings. It is a bibliography.. So.. It would be like: Publication. Date. Title. Authours. Isbn. All the info is on the document already and I have been told to turn it into a XML Document so it can be published to a website as separate entries. Please HelP!