Module:GetParameters/doc

getParameters
Takes 2 required arguments,  and. Parses a frame's arguments, returning either the provided named arguments in  if found or the positional parameters instead if not. This is designed to work around the stripping of values that takes place for defined parameters which could be important.

As an example, the calls  and   would both give back.

getBoolean
Takes 1 required argument. Turns the input into a true/false boolean value based on the input. Will error if given anything other than a string or boolean value.

defined
To be invoked from inside a template instead of a module. Determines if a certain parameter is defined in the parent frame's arguments.