exported EPS from a landscape inkscape document contains "%%Orientation: Portrait" string.
==== %!PS-Adobe-3.0 EPSF-3.0 %%Creator: inkscape 0.43+devel %%Pages: 1 %%Orientation: Portrait %%BoundingBox: 0 0 482 171 == cut == inkscape document type is landscape!
exported EPS from a landscape inkscape document contains
"%%Orientation: Portrait" string.
====
%!PS-Adobe-3.0 EPSF-3.0
%%Creator: inkscape 0.43+devel
%%Pages: 1
%%Orientation: Portrait
%%BoundingBox: 0 0 482 171
== cut ==
inkscape document type is landscape!