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-libs/xerces-c-3.3.0-r1:0/3.3::gentoo  USE="iconv -curl -doc -examples -icu -static-libs -test" CPU_FLAGS_X86="sse2" 4211 KiB
[ebuild  N     ] app-text/blahtexml-1.0-r1::gentoo  USE="-doc" 187 KiB

Total: 2 packages (2 new), Size of downloads: 4398 KiB