This approach is incompatible with URI standard. U should use "multiple:{...}" or something like that.
Can you give an example?
Or, if something was preprended to this string would it then become compatible?
E.g.:
nxtjsonalias:{"web":"http://www.notsoshifty.de/","fb":"notsoshifty","twitter":"notsoshifty","nxtacct":"11111125831111116332","smtp":"notsoshifty111@example.com","skype":"notsoshifty1971"}
(not saying that's a good choice of name - just to illustrate the concept)