Merge pull request #139 from handrews/const

Add "const" keyword for constant values.

Author: awwright

jsonschema-validation.xml

@@ -546,6 +546,16 @@
                 </t>
             </section>
 
+            <section title="const">
+                <t>
+                    The value of this keyword MAY be of any type, including null.
+                </t>
+                <t>
+                    An instance validates successfully against this keyword if its value is
+                    equal to the value of the keyword.
+                </t>
+            </section>
+
             <section title="type">
                 <t>
                     The value of this keyword MUST be either a string or an array. If it is

schema.json

@@ -124,6 +124,7 @@
                 ]
             }
         },
+        "const": {},
         "enum": {
             "type": "array",
             "minItems": 1,