Contants for structured v03

Signed-off-by: Fabio José <fabiojose@gmail.com>

lib/bindings/http/constants.js

@@ -45,5 +45,17 @@ module.exports = {
     CONTENT_ENCONDING : "ce-datacontentencoding",
     SUBJECT           : "ce-subject",
     EXTENSIONS_PREFIX : "ce-"
+  },
+  STRUCTURED_ATTRS_03 : {
+    TYPE              : "type",
+    SPEC_VERSION      : "specversion",
+    SOURCE            : "source",
+    ID                : "id",
+    TIME              : "time",
+    SCHEMA_URL        : "schemaurl",
+    CONTENT_ENCONDING : "datacontentencoding",
+    CONTENT_TYPE      : "datacontenttype",
+    SUBJECT           : "subject",
+    DATA              : "data"
   }
 };