Template:Pi zero/context/button/delta/doc

Usage
This subtemplate of User:Pi zero/context/button computes dialog parameter  to be passed through the button. Unnamed template parameters passed to this template name dialog parameters to be whitelisted; template parameter  passed here names a template to be informed.

Examples
The result list-of-lists starts with a list of allowed parameters, then a list of disallowed parameters, then one or more lists naming a template followed by the names of parameters it requests.

Internals
This template calls evalx using Module:TScope; the wikilisp code to be executed thus becomes the first unnamed parameter to evalx, while the unnamed parameters passed to the parent template become later unnamed parameters to evalx. If a  parameter is passed to this template, a query to   subtemplate   is also passed to evalx under parameter name.