use cases: Grammar

Author: awwright

jsonschema-use-cases.xml

@@ -199,7 +199,7 @@ expressed as a context-free grammar that follows JSON
 
         <section title="Use cases for extensions">
             <t>
-                This section lists use cases that not required for interoperability in media type handling, but which should be defined as standard extensions to maximize support and feature interoperability.
+                This section lists use cases that are not required for interoperability in media type handling, but which should be defined as standard extensions to maximize support and feature interoperability.
                 As specified in <xref target="extension-points">"Extension points,"</xref>
                 validators should gracefully degrade in the presence of extensions that they do not support.
             </t>