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 ]]