pitrou commented on code in PR #47456:
URL: https://github.com/apache/arrow/pull/47456#discussion_r2318109671


##########
docs/source/format/CanonicalExtensions.rst:
##########
@@ -45,7 +45,11 @@ types:
 
 * The specification text to be added *must* follow these requirements:
 
-  1) It *must* define a well-defined extension name starting with "``arrow.``".
+  1) It *must* define a well-defined extension name starting with an allowed 
prefix.
+     The currently allowed prefixes are:
+     * "``arrow.``" - For general-purpose canonical extension types.
+     * "``parquet.``" - For canonical extension types that are intended 
primarily for

Review Comment:
   I find it unlikely that the Parquet project would separately define its own 
Arrow extension types.



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