URF Comparison Matrix

	SURF	TURF	JSON	RDF/XML / Turtle
Types
Objects	Yes	Yes	Yes JSON “objects” are really maps with keys restricted to strings.	Yes “resource descriptions”
String, Number, Boolean	Yes	Yes	Yes	Yes
Date	Yes	Yes	No	Yes
IRI / URI	Yes	Yes	No	Yes
UUID, Regular Expression, Telephone Number, Email Address	Yes	Yes	Yes	No
Binary	Yes	Yes	No	Yes
Collections: List, Set, Map	Yes	Yes	List-like array. No set. JSON “objects” are really maps, but keys are restricted to strings.	Containers (open): sequence, bag, alternative. List (closed). No map.
Tables	Yes	Yes	No	No
Null	Read but ignored.	Read but ignored.	Yes	No
Data Model
Object Identifiers	Yes	Yes	No	Yes
Repeated Object Properties	No	Yes	No	Yes
Graph References	Yes	Yes	No	Yes
Ontology	Yes	Yes	No	Yes
Reification	No	Yes	No	Yes
Serialization
Comments	Yes	Yes	No	Yes
Human Readable	Yes	Yes	Yes	RDF/XML: verbose. RDF/Turtle: cryptic.
Document Metadata	No	Yes	No	No
JSON Backwards Compatible	Yes	Yes	Yes	No