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

Calculating dependencies ... done!
Dependency resolution took 1.74 s (backtrack: 0/20).

[ebuild  N     ] virtual/fortran-0-r1::gentoo  USE="openmp" 0 KiB
[ebuild  N     ] x11-apps/xprop-1.2.8::gentoo  144 KiB
[ebuild  N     ] media-libs/libxmi-1.3-r2::gentoo  253 KiB
[ebuild  N     ] media-libs/plotutils-2.6-r3::gentoo  USE="X png" 3572 KiB
[ebuild  N     ] x11-apps/xset-1.2.6::gentoo  143 KiB
[ebuild   R    ] app-text/xmlto-0.0.28-r11::gentoo  USE="text* -latex" 125 KiB
[ebuild  N     ] x11-misc/xdg-utils-1.2.1-r11::gentoo  USE="X dbus -doc -gnome -perl -plasma" 287 KiB
[ebuild  N     ] sci-mathematics/dataplot-20131220::gentoo  USE="X opengl -examples -gd" 13935 KiB

Total: 8 packages (7 new, 1 reinstall), Size of downloads: 18458 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by x11-misc/xdg-utils-1.2.1-r11::gentoo
# required by sci-mathematics/dataplot-20131220::gentoo[X]
# required by =sci-mathematics/dataplot-20131220 (argument)
>=app-text/xmlto-0.0.28-r11 text