--> the conflict <--
I think they mean the same thing but use a different wording.
About extended partitions:
the first 512 bytes of the partition contain another partition table, which describes how the extended partition itself is layed out.
There are two "standards" around:
first one (used by DOS, works on Linux too)
is to use the first entry of that table for a real, "data" partition
and the second entry (if needed) for another nested extended partition that
will describe the remaining partitions in the same way.
So you get a chain of extended partitions, when each one describes the next one
and also a "data" (ext2, DOS or whatever you like) partition.
second one (accepted by Linux at least)
allows using as many entries as you want in an extended partition, with the
limit that is contains at most another extended partition.
At the end, you got it working, don't you?