These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] dev-tcltk/tdom-0.9.6::gentoo  USE="threads -test" 1495 KiB
[ebuild  N     ] dev-tcltk/tcllib-2.0::gentoo  USE="-examples -test" 14524 KiB
[ebuild  N     ] dev-tcltk/tclxml-3.3.1-r4::gentoo  USE="threads -debug" 666 KiB

Total: 3 packages (3 new), Size of downloads: 16685 KiB