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Preprocessor directives are similar to a [[WikiLink]] in form, except they contain spaces and parameters. The general form is:

\[[directive param="value" param="value"]]

This gets expanded before the rest of the page is processed, and can be used to transform the page in various ways.

Note that if a preprocessor directive has no parameters, a space still must be put after its name, to avoid confusion with a [[WikiLink]]. For example:

\[[pagecount ]]