Recover subscriptions by module name

index.bs

@@ -789,6 +789,29 @@ given |event name| and |session| is:
 
 </div>
 
+<div algorithm>
+To <dfn>obtain a set of event names</dfn> given an |name|:
+
+1. Let |events| be an empty [=/set=].
+
+1. If |name| contains a U+002E (period):
+
+  1. If |name| is the [=event name=] for an event, append |name| to |events|
+     and return [=success=] with data |events|.
+
+  1. Return an [=error=] with [=error code=] [=invalid argument=]
+
+1. Otherwise |name| is interpreted as representing all the events in a
+   module. If |name| is not a [=module name=] return an [=error=] with
+   [=error code=] [=invalid argument=].
+
+1. Append the [=event name=] for each [=event=] in the module with name |name| to
+   |events|.
+
+1. Return [=success=] with data |events|.
+
+</div>
+
 # Transport # {#transport}
 
 Message transport is provided using the WebSocket protocol.