Question on property behaviour descriptions in RFC2518bis

Hi,

as a follow up to BugZilla issue 247 
(http://ietf.osafoundation.org:8080/bugzilla/show_bug.cgi?id=247>) which 
I opened a few days ago (but which was originally raised during Last 
Call) I'm currently confused by statements like:

    COPY/MOVE behaviour:  This property value SHOULD be kept during a
       MOVE operation, but is normally re-initialized when a resource is
       created with a COPY.  It should not be set in a COPY.

(see 
<http://greenbytes.de/tech/webdav/draft-ietf-webdav-rfc2518bis-15.html#rfc.section.15.1>).

Questions:

1) When a resource is being created, shouldn't DAV:creationdate *always* 
be set (by definition?)

2) What does "should not be set in a COPY" mean? What does "in a COPY" 
refer to?

There are similar problems with other COPY/MOVE behaviour statements, 
but maybe we can focus on this one first...

Best regards, Julian