Suggestion for namespace prefix

[Subbu Allamaraju <subbu@bea.com>]

I would like to know if you have any suggestions for the namespace 
prefixes used in the primer. Right now we use "urn" which is somewhat 
generic.

Some choices: "wsrp", "plt"

I tried "wsrp-types" but it is too long and caused most of the lines in 
messages to break.

Thanks for any suggestions or preferences.

Subbu