usefor-usefor-01 September 2004

3.2.10  Xref

   The Xref header indicates where an article was filed by the last
   serving agent to process it.

   xref            =  "Xref:" SP [CFWS] server-name
            1*( CFWS location ) [CFWS] CRLF

   server-name     =  path-identity

   location        =  newsgroup-name ":" article-locator

   article-locator =  1*( %x21-27 / %x29-3A / %x3C-7E )
            ; US-ASCII printable characters
            ; except '(' and ';'

   The server-name is included so that software can determine which
   serving agent generated the header.  The locations specify what
   newsgroups the article was filed under (which may differ from those
   in the Newsgroups-header) and where it was filed under them.  The
   exact form of an article-locator is implementation-specific.

   NOTE: The traditional form of an article-locator (as used by NNTP) is
   a decimal number, with articles in each newsgroup numbered
   consecutively starting from 1.

--- ../usefor-article-13/Xref.out          May 2004
+++ ../usefor-usefor-01/Xref.out          September 2004
@@ -1,14 +1,15 @@
-6.16.  Xref
+3.2.10  Xref
 
-   The Xref-header is a variant header (4.2.5.3) which indicates where
-   an article was filed by the last serving agent to process it.
+   The Xref header indicates where an article was filed by the last
+   serving agent to process it.
+
+   xref            =  "Xref:" SP [CFWS] server-name
+            1*( CFWS location ) [CFWS] CRLF
+
+   server-name     =  path-identity
 
-      header            =/ Xref-header
-      Xref-header       = "Xref" ":" SP Xref-content
-                   *( ";" extension-parameter )
-      Xref-content      = [CFWS] server-name 1*( CFWS location ) [CFWS]
-      server-name       = path-identity  ; see 5.6.1
       location          = newsgroup-name ":" article-locator
+
       article-locator   = 1*( %x21-27 / %x29-3A / %x3C-7E )
                    ; US-ASCII printable characters
                    ; except '(' and ';'
@@ -19,19 +20,7 @@
    in the Newsgroups-header) and where it was filed under them. The
    exact form of an article-locator is implementation-specific.
 
-        NOTE: The traditional form of an article-locator is a decimal
-        number, with articles in each newsgroup numbered consecutively
-        starting from 1. NNTP demands that such a model be provided, and
-        much other software expects it, but it seems desirable to permit
-        flexibility for unorthodox implementations.
-
-   An agent inserting an Xref-header into an article MUST delete any
-   previous Xref-header(s). A relaying agent MAY delete it before
-   relaying, but otherwise it SHOULD be ignored by any relaying or
-   serving agent receiving it.
-
-   It is convenient, though not required, for a serving agent to use the
-   same server-name in Xref-headers as the path-identity it uses in
-   Path-headers (just so long as reading agents can distinguish it from
-   other serving agents known to them).
+   NOTE: The traditional form of an article-locator (as used by NNTP) is
+   a decimal number, with articles in each newsgroup numbered
+   consecutively starting from 1.