File System

Other Data Models

The entity-relationship and relational models are just two of the models that have importance in database systems today. In this section we shall introduce you to various other models of rising importance.

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

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