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Today, XML is used in three different ways. First, XML is used as a markup language, where documents are considered to be trees (with the occasional hyper link added) which represent the document structure. Secondly, XML is used as an interchange format for structured data. Here, a document is considered as a set of fields, each of which has a specific data type. The third aspect is to use XML to represent text, where a document consists of words which can be stemmed and phrases and the like.
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