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

Calculating dependencies ... done!
Dependency resolution took 1.71 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/gobject-introspection-common-1.86.0::gentoo  1058 KiB
[ebuild  N     ] dev-libs/vala-common-0.56.19::gentoo  3914 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-libs/gdk-pixbuf-2.44.8:2::gentoo  USE="gif jpeg tiff -gtk-doc -introspection -test" 5897 KiB
[ebuild  N     ] gnome-base/librsvg-2.58.5-r1:2::gentoo  USE="-debug -gtk-doc -introspection -vala" 62732 KiB

Total: 5 packages (4 new, 1 in new slot), Size of downloads: 73682 KiB