Merge pull request opencontainers#584 from wking/json-object-no-order-or-duplicates

glossary: Make objects explicitly unordered and forbid duplicate names

Author: hqhq

glossary.md

@@ -20,6 +20,8 @@ On Linux, a leaf in the [namespace][namespaces.7] hierarchy in which the [config
 ## JSON
 
 All configuration [JSON][] MUST be encoded in [UTF-8][].
+JSON objects MUST NOT include duplicate names.
+The order of entries in JSON objects is not significant.
 
 ## Runtime
 
@@ -31,6 +33,6 @@ It reads the [configuration files](#configuration) from a [bundle](#bundle), use
 On Linux, a leaf in the [namespace][namespaces.7] hierarchy from which the [runtime](#runtime) process is executed.
 New container namespaces will be created as children of the runtime namespaces.
 
-[JSON]: http://json.org/
+[JSON]: https://tools.ietf.org/html/rfc7159
 [UTF-8]: http://www.unicode.org/versions/Unicode8.0.0/ch03.pdf
 [namespaces.7]: http://man7.org/linux/man-pages/man7/namespaces.7.html