confused by multiconfig explanation in bitbake manual

["Robert P. J. Day" <rpjday@crashcourse.ca>]

  i've never defined a multiconfig build, but this section explaining
it in the BB user manual seems confusing:

///// start

The following statement in the local.conf file both enables BitBake to
perform multiple configuration builds and specifies the two extra
multiconfigs:

     BBMULTICONFIG = "target1 target2"

Once the target configuration files are in place and BitBake has been
enabled to perform multiple configuration builds, use the following
command form to start the builds:

     $ bitbake [mc:multiconfigname:]target [[[mc:multiconfigname:]target] ... ]

Here is an example for two extra multiconfigs: target1 and target2:

     $ bitbake mc::target mc:target1:target mc:target2:target

///// end

  i don't understand the "mc::target" part of that last command, as it
does not seem to be compatible with the definition of the general form
of the command just above that, specifically:

      $ bitbake [mc:multiconfigname:]target ...

can someone clarify this?

rday