"Rules, Standards, and Principles"

Here's something from a post over at Steve Bainbridge's other blog, about "rules, standards, and principles."  Quoting Larry Solum, Steve writes:

• Rules are the most constraining and rigid. Once a rule has been interpreted and the facts have been found, then the application of the rule to the facts decides the issue to which it is relevant.
• Standards provide an intermediate level of constraint. Standards guide decisions but provide a greater range of choice or discretion; for example, a standard may provide a framework for balancing several factors.
• Principles are even less constraining. Principles provide mandatory considerations for judges. Whereas, standards identify an exhaustive set of considerations for adjudication or policy making, a principle identifies a nonexhaustive set, leaving open the possibility that other considerations may be relevant to the decision. ...

So, what is it that Catholic Social Teaching gives us?  Rules, standards, or principles?