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#### Notations

Throughout this document, we will refer to functions, types and variables with typewriter font. Functions and procedures have their own subsections, and for each function or procedure we have the following topics:

Declaration
  The exact declaration of the function.
Description
  What does the procedure exactly do ?
Errors
  What errors can occur.
See Also
  Cross references to other related functions/commands.

The cross-references come in two flavours:

- References to other functions in this manual. In the printed copy, a number will appear after this reference. It refers to the page where this function is explained. In the on-line help pages, this is a hyperlink, which can be clicked to jump to the declaration.
- References to Unix manual pages. (For linux and unix related things only) they are printed in typewriter font, and the number after it is the Unix manual section.

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