A pragma is a special component of WikiText that provides control over the way the remaining text is parsed.
Pragmas occupy lines that start with \. They can only appear at the start of the text, but blank lines are allowed between them. If a pragma line appears in the main body of the text, it is treated as if it was ordinary text.
The following pragmas are available:
\define\rules\whitespace trim or \whitespace notrim\import <filter-expression>