Reword part of Req 27.

Author: pvretano

extensions/schemas/standard/clause_13_profile_parameter.adoc

@@ -40,8 +40,10 @@ explode: false
 ^|B |Each item SHALL be one of the follwoing:
 
 * The profile identifier of a profile in the OGC Profile Register (the `profileId` value in the URI template `\http://www.opengis.net/def/profile/OGC/0/{profileId}`);
-* A HTTP(S) URI of a profile, e.g., in the OGC Profile Register (\http://www.opengis.net/def/profile).
-|===
+* A HTTP(S) URI of a profile
+|=== 
+
+NOTE: Profile URIs could be URIs from the OGC Profile Register (\http://www.opengis.net/def/profile) but they do not have to be.  For example, communities of interest can develop and document their our profile URIs without the involvement of OGC.
 
 :per: profile-param-default
 [#{req-class}_{per}]