Validate that a string is in X509SubjectName format.

[Peter Schober]

* Weaver, Matthew (CGI Federal) <Matthew.Weaver at cgifederal.com> [2013-07-26 18:52]:
> I have been very happily using opensaml [...]

Please use the dev list for OpenSAML questions (including for
developing /with/ opensaml),
-peter