Updated 12050 documents

I've reflected (I believe) the changes requested by
Michael and Robert as summarized in [1] and [2] in
the attached files (that use highlighting to show
the changes for easier re-review).

Comments solicited.

paul

[1] http://lists.oasis-open.org/archives/dita/200707/msg00022.html
[2] http://lists.oasis-open.org/archives/dita/200707/msg00023.html