usefor-usepro-03 February 2005

2.3.  Variant Headers

   Headers with the variant property may differ between (or even be
   completely absent from) copies of the same article as stored or
   relayed throughout a Netnews system. The manner of the difference (or
   absence) MUST be as specified in this (or some future) standard.
   Typically, these headers are modified as articles are propagated, or
   they reflect the status of the article on a particular serving agent,
   or cooperating group of such agents. A variant header MAY be placed
   anywhere within the headers (though placing it first is recommended).

   The following headers are classified as "variant":
     o Path (F-3.1.6) - augmented at each relaying agent that an article
       passes through.
     o Xref (F-3.2.10) - used to keep track of the <article-locator>s of
       crossposted articles so that reading agents serviced by a
       particular serving agent can mark such articles as read.
     o Injection-Info (F-3.2.13) is also considered variant in some
       special situations involving reinjection (7.2 and 7.2.2).

--- ../usefor-usepro-02/Variant_Headers.out          December 2004
+++ ../usefor-usepro-03/Variant_Headers.out          February 2005
@@ -1,4 +1,4 @@
-2.3.2.  Variant Headers
+2.3.  Variant Headers
 
    Headers with the variant property may differ between (or even be
    completely absent from) copies of the same article as stored or
@@ -6,15 +6,15 @@
    absence) MUST be as specified in this (or some future) standard.
    Typically, these headers are modified as articles are propagated, or
    they reflect the status of the article on a particular serving agent,
-   or cooperating group of such agents. The variant header MAY be placed
+   or cooperating group of such agents. A variant header MAY be placed
    anywhere within the headers (though placing it first is recommended).
 
-
-   The following headers (see [USEFOR] for their definitions) are
-   classified as "variant":
-     o Path (a-5.6) - augmented at each relaying agent that an article
+   The following headers are classified as "variant":
+     o Path (F-3.1.6) - augmented at each relaying agent that an article
        passes through.
-     o Xref (a-6.16) - used to keep track of the article locators of
+     o Xref (F-3.2.10) - used to keep track of the <article-locator>s of
        crossposted articles so that reading agents serviced by a
        particular serving agent can mark such articles as read.
+     o Injection-Info (F-3.2.13) is also considered variant in some
+       special situations involving reinjection (7.2 and 7.2.2).