Accessing unit's data fields

Accessing unit's data fields

Is possible (via triggers or JASS) to access unit data fields?
Ex.:

IF (triggering unit) 'attack type' equal to 'normal'
THEN <actions>
or

IF (triggering unit) 'movement type' equal to 'foot'
THEN <actions>

I don't think it is possible to change the attack/movement type through triggers, so even if that was possible it would be useless if it is not made for a spell.

-Rui