Document Type Definitions

In order for a computer to process XML documents automatically, there needs to be something like a schema for the documents. That is, we need to be told what tags can appear in a collection of documents and how tags can be nested. The description of the schema is given by a

Attribute Lists

There is a strong relationship between XML documents and semistructured data. Assume that for some pair of matching tags and in a document we make a node n. Then, if and are matching tags nested directly within the pair and (i.e., there are no

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