NIEM JSON Specification, version 5.0

The NIEM JSON Specification establishes the technical basis for using JavaScript
Object Notation (JSON) as a data format for exchange of information consistent
with NIEM-conformant schemas and information exchange package documentations
(IEPDs).

Changes:

• Adds JSON Normalization section, including examples
• Updates Reference Appendix
• Updates rule 5-2 to reference NIEM JSON normalization
• Adds short description of construction of @type annotations, along with appropriate external reference