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## Chapter 2. The Structure of a LATEX Document

One of the ideas behind LATEX is the separation between layout and structure (as far as possible), which allows the user to concentrate on content rather than having to worry about layout issues [104]. This chapter explains how this general principle is implemented in LATEX.

The first section of this chapter shows how document class files, packages, options, and preamble commands can affect the structure and layout of a document. The logical subdivisions of a document are discussed in general, before explaining in more detail how sectioning commands and their arguments define a hierarchical structure, how they generate numbers for titles, and how they produce running heads and feet. Different ways of typesetting section titles are presented with the help of examples. It is also shown how the information that is written to the table of contents can be controlled and how the look of this table, as well as that of the lists of tables and figures, can be customized. The final section introduces LATEX commands for managing cross-references and their scoping rules.

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