Proposed changes for <chkscope>

I think I received no feedback for this proposed diff other than
agreement from Julien.  Given that we're in AUTH48, in the absence of
more consensus on the list that this is worth pushing at this phase, I'm
not going to try to ask the RFC Editor to include it.

So if you want me to push for this change, please speak up now.

Index: usepro.xml
===================================================================
--- usepro.xml  (revision 5949)
+++ usepro.xml  (working copy)
@@ -2022,14 +2022,24 @@
           the valid groups in all hierarchies or sub-hierarchies with a
           prefix listed in the <chkscope> argument, excluding any
           sub-hierarchy where the <chkscope> argument is prefixed by
-          "!".  If no <chkscope> argument is given, it applies to all
+          "!".  For complex cases with multiple <chkscope> arguments,
+          start from an empty list of groups, include all groups in the
+          checkgroups control message matching <chkscope> arguments
+          without a "!" prefix, and then exclude all groups matching
+          <chkscope> arguments with a "!" prefix.  Follow this method
+          regardless of the order of the <chkscope> arguments in the
+          Control header field.</t>
+
+          <t>If no &lt;chkscope> argument is given, it applies to all
           hierarchies for which group statements appear in the body of the
-          message.  Since much existing software does not honor the
-          &lt;chkscope> argument, the body of the checkgroups control
-          message MUST NOT contain group statements for newsgroups outside
-          the intended scope and SHOULD contain a correct newsgroup list
-          even for sub-hierarchies excluded with "!" &lt;chkscope> terms.
-          News servers, however, MUST honor &lt;chkscope> as specified
+          message.</t>
+
+          <t>Since much existing software does not honor the &lt;chkscope>
+          argument, the body of the checkgroups control message MUST NOT
+          contain group statements for newsgroups outside the intended
+          scope and SHOULD contain a correct newsgroup list even for
+          sub-hierarchies excluded with "!" &lt;chkscope> terms.  News
+          servers, however, MUST honor &lt;chkscope> as specified
           here.</t>
 
           <t>The &lt;chksernr> argument may be any positive integer.  If

-- 
Russ Allbery ([email protected])             <http://www.eyrie.org/~eagle/>