Originally Posted by Fenryr
According to this
: Half-elves are Humanoid creatures with both the human and the elf subtypes.
Same applies to Half-Orcs
: Half-orcs are Humanoid creatures with both the human and orc subtypes.
Same goes for archetypes and prestige classes.
Although I haven't seen it written anywhere, it almost seems like most of the Human-Only, Elf-Only, and Orc-Only stuff was written with the intent
that it wouldn't
apply to the Half-Races.
Each of the 'Main 7' races got 4 Race-Specific archetypes each (and/or Race-Specific Bloodline/Order/whatever). With all of the other races getting 1-to-3 Race-Archetypes.
This means that Humans get access to 4, Elves get 4, and Orcs get 2. While Half-Elves get _12_ (4 Human, 4 Elf, 4 Half-Elf), and Half-Orcs get _10_ (4 Human, 2 Orc, 4 Half-Orc).
It seems like (once again) Paizo was asleep at the wheel.