Template:Yesno/doc

Yesno evaluates any input and produces a normalized yes or no, based on the content of the input and several configurable options. It is not used in article prose, but in coding complex templates.

Usage
The template distinguishes five different types of input, supplied on the first unnamed parameter:
 * 1) Yes: Case-insensitive forms of ,  ,  , and  ; e.g. yEs
 * 2) No: Case-insensitive forms of ,  ,  , and  ; e.g. nO
 * 3) Nothing: When the input is defined but either contains no value or consists of whitespace character only; i.e.   or Yesno
 * 4) Negation: When the input is either   or entirely missing; i.e. ¬ or Yesno
 * 5) Anything else: e.g. Purple monkey dish washer

By default, the template returns "yes" in the first and last case but returns blank in the other cases.

Customizing the output
Template's default output can be customized with five named parameters, respectively:,  ,  ,   and. If these parameters are specified, the template response is as follows:
 * 1) Yes: Template returns the contents of , otherwise returns "yes". For example:
 * 2) * y results in ""
 * 3) * y results in ""
 * 4) No: Template returns the contents of , otherwise returns blank. For example:
 * 5) * n results in ""
 * 6) * n results in ""
 * 7) Nothing: Template returns the contents of , or of   in absence of the former; otherwise, returns blank.
 * 8) * yesno results in ""
 * 9) * yesno results in ""
 * 10) * yesno results in ""
 * 11) Negation: Template returns the contents of , otherwise returns blank. For example:
 * 12) * ¬ results in ""
 * 13) Anything else: Template returns the contents of , or of   in absence of the former; otherwise, returns "yes".
 * 14) * purple monkey dish washer results in ""
 * 15) * purple monkey dish washer results in ""
 * 16) * purple monkey dish washer results in ""

For the named parameters, use of a blank value is not the same as omitting the parameter. A blank named parameter tells the template that the customized return value is blank. For example:
 * purple monkey dish washer results in ""
 * purple monkey dish washer results in "" [blank]

Wikipedia
For more information, see the original template on Wikipedia: Template:Yesno