vocabulary for legal decision (e.g., Supreme Court cases)

I've noticed that schema.org doesn't provide vocabulary for legal
decisions--e.g., the Supreme Court case Citizens United vs Federal Election
Commission:

http://en.wikipedia.org/wiki/Citizens_United_v._FEC
http://caselaw.lp.findlaw.com/scripts/getcase.pl?court=us&vol=000&invol=08-205

One challenge for modeling this domain is coming up with a model that
accommodates different types of courts, both within and between countries.
It may be easier to develop a model for US legal decisions first and then
expand it later or create other types for non-US courts.

With that in mind, I would propose the type USLegalDecision with the
following properties:

name: the name of the decision (for Supreme Court cases, usually something
like "X v Y")
court: the court where the decision was made (e.g., Supreme Court)
country:the country where the decision applies
whenArgued: the date on which arguments
whenDecided: the date on which the decision was rendered
citation: the case citation for the decision
courtAppealedFrom: which court the case was appealed from (optional since
some cases low-level courts aren't appealed from another court) [note:
optional given that a decision in a lower court won't be appealed from
another court]

Using the Citizens United example, here's what the values might look like:

name: "Citizens United versus FEC"
court: "Supreme Court"
country: "USA"
whenArgued: [ "March 24, 2009", "September 9, 2009" ]
whenDecided: "January 21, 2010"
citation: "Citizens United v. Federal Election Comm'n, (558 U.S. ___
(2010); Docket No. 08-205)"
courtAppealedFrom: "United States District Court for the District of
Columbia"

There are some additional properties to consider, such as the following:

Judge(s)
OpinionAuthor
ConcurrenceAuthor
DissentAuthor
LegalHolding(s)

Thoughts on the general modeling issues here (e.g., US-specificity) and
feedback on the specific proposal would be greatly appreciated.

Thanks,
Stuart Robinson