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

Calculating dependencies ... done!
Dependency resolution took 1.56 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/File-Which-1.270.0-r1::gentoo  USE="-pwhich -test" PERL_FEATURES="ithreads (-debug) -quadmath" 25 KiB
[ebuild  NS    ] app-text/docbook-xml-dtd-4.3-r2:4.3::gentoo [4.1.2-r7:4.1.2::gentoo, 4.2-r3:4.2::gentoo, 4.4-r3:4.4::gentoo, 4.5-r2:4.5::gentoo] 82 KiB
[ebuild  N     ] x11-misc/xdg-user-dirs-0.20::gentoo  USE="-gtk" 53 KiB
[ebuild  N     ] dev-perl/File-HomeDir-1.6.0-r1::gentoo  USE="xdg -test" PERL_FEATURES="ithreads (-debug) -quadmath" 36 KiB

Total: 4 packages (3 new, 1 in new slot), Size of downloads: 194 KiB