Let me respond as well.
Many civil law jurisdictions do not require specific implementation of a treaty or a treaty's provision into domestic law. The treaty becomes part of domestic law through the act of ratification. In other words, you will not see any legislation from certain states on treaties.
In the common law systems, we're required to give it effect domestically. It's called a “dualist” system of international law, as opposed to a “monist” system whereby essentially, once you ratify the treaty, it becomes law. That's the distinction.