Conflicting docs on source package parameters

Usage
#1

CPack has a section on »Variables for Source Package Generators«. These variables start with CPACK_SOURCE_.

CPack Archive Generator has a section on »Variables specific to CPack Archive generator«. These variables start with CPACK_ARCHIVE_.

What is the relation between these two sets of variables?

Could the doc sections be improved by some cross references?

#2

The Archive generators are intended for packaging install trees into standard archive formats such as .zip or the .tar family. The source generators package up the source code and don’t involve an installation step.