Is it possible to do Transformation Constraints with Animation Nodes? I would like control an object rotation over another object location/translation.
Yes, this is possible.
You can read an object's transform values with the Object Transforms Input node and set them on another object with the Object Transforms Output node.
If you'd like to read an object's absolute location in world space as it might be the child of some other object, you could use the Object Matrix Input node.