Split displayName to givenName and cn

[Cantor, Scott]

> Clearly you cannot derive given name from displayName unless you make
> some false assumptions about users' names, such as given names (or
> alternatively surnames) contain no spaces. How else would you parse Joan
> Paul Jones?

Right. You can make all the assumptions you like, in which case you can go read the SP documentation (see NativeSPAttributeResolver) on the Transform plugin to see how to do it, but they are ultimately assumptions and the real answer is that you really can't do this if you don't control the IdP.

-- Scott