Option
Parameters
names
The names that can be used to invoke this option
secondary Names
Secondary names that can be used to e.g. disable the option
metavar
The metavar to display for the option if it takes values
help
The option's description
nvalues
The number of values that this option takes
tags
Any extra tags to display with the help message for this option
group Name
The name of the group this option belongs to, if there is one and its name should be shown in the help message