RDFj suggestions

its nice to see a writeup on this

 * usage of '$'

  this is pretty nondescript. how about 'uri' ?

 * "<uri>" to get around the lack of URI literal in JSON

   requires looking inside strings to see if object of triple is resource or (really a) string

  what ive been doing for years (asides from using uri instead of $) is using a resource to denote a resource so 
 

 "<http://example.org/resource>" becomes {uri: "http://example.org/resource"}


  otherwise, looking great. i hadnt used the token/namespace feature at all but the repetition of rather largeish predicate URIs had got me thinking about it