I understand that the double strike mechanic allows a creature to attack in both a first strike combat damage step and a normal combat damage step.
It's clear that when a creature with no other abilities aside from double strike is blocked that even if the defender has lethal damage marked in the first strike step that the additional damage does not carry forward to the player.
How does this view of double strike change with relation to trample and lifelink?
I believe the correct interpretations are (not accounting for other effects or abilities) that 2 times the attacker's power is marked as damage on the defender. For trample this amount is reduced by the defender's toughness and additional damage carries forward as normal. Similarly for lifelink the active player gains life equal to 2 times the attacker's power.
Thus a 10/10 trampling double striking life linker blocked by a 1/1 creature would deal 19 points of trample damage and the active player would gain 20 life.
Is this interpretation correct?