What follows is a formal presentation of the syntax of the Pragma: \procedure, using railroad diagrams.

\procedure

There are 2 types of procedure definitions

• Single line definitions
• Multi line definitions

Single Line

Single line definitions should only be used for very short bodies, where the procedure name, params and the body fit into 1 line terminated with a line-feed.

Multi Line

The majority of procedure definitions will have a body, that spans over several lines of wikitext. Those procedure definitions are terminated using the "\end" pragma

The procedure-name is a sequence of non-whitespace characters other than ( or >.

• procedure-name is a sequence of letters (A–Z, a–z), digits (0–9), hyphens (-) and underscores (_)
• body is wikitext including nested procedures
• space denotes a sequence of whitespace characters

params

The parameter declaration list (params) has the following syntax:

• sep is any sequence of characters that does not match a param-name.
  Among other things, this includes commas, spaces and linefeeds.

Each individual parameter has the following syntax:

• param-name is a sequence of letters (A–Z, a–z), digits (0–9), hyphens (-) and underscores (_).
• default is an optional value of a parameter is specified as follows:

body

The body of the definition has the following syntax:

• wikitext is any sequence of characters that doesn't terminate the macro definition.
  • If nested procedures are used they need to be at the start of the wikitext. There are the same rules as if the wikitext would be in a tiddler.
  • Pragmas need to be before standard wikitext.
• lf denotes a linefeed.