Template:Var/doc

is used on templates such as the infobox templates, and the summaryboxes which give out a pre-formatted set of parameters to display default values properly. Because the pre-formatted set of parameters sets out the variable names using the default value in the form  does not work because even if the value is not used the parameter is still named in the template. Using this template a default can be told to show not only when the value is not set, but also if the value is left blank.

Usage

 * variable is the normal variable used. Be sure to use the | to set the default to nothing so that removing the parameter from the inclusion won't affect the way things are displayed (i.e. use for example).
 * default value is the default value to be outputed, this would normally be what you would put after the | in a variable call.
 * If variable is set to some value then variable will be outputted.
 * If variable is unset, or set to nothing but whitespace then default value will be outputted.