From 9c89390c76a800e513c9df82ee51a1c30f28ac82 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Fri, 08 Jan 2021 18:57:54 -0500
Subject: SPF 2.0: Allow epochs in version identifiers

---
diff --git a/specs/spf-2.0/metadata.mdwn b/specs/spf-2.0/metadata.mdwn
index 74fdefe..36f4326 100644
--- a/specs/spf-2.0/metadata.mdwn
+++ b/specs/spf-2.0/metadata.mdwn
@@ -129,7 +129,14 @@ Source Package Version Identifier [src-ver]
 
 In general, the syntax of source package version identifiers is:
 
-    <pkgver>[+sip<siprev>][-<pkgrev>][+<dist>~<distrev>][~bpu<distnum>+<bpurev>]
+    [<epoch>:]<pkgver>[+sip<siprev>][-<pkgrev>][+<dist>~<distrev>][~bpu<distnum>+<bpurev>]
+
+`<epoch>` should almost always be omitted, in which case it is effectively zero.
+It may be used when the upstream version numbering scheme changes or when one or
+more binary packages are migrated to a different source package with a different
+upstream version numbering scheme.  It must be a string of one or more digits,
+the first of which must be greater than or equal to `1`.  (A regular expression
+for this is `[1-9][0-9]*`.)
 
 `<pkgver>` is the version of the original upstream package or the native
 package.  It may only consist of lowercase Latin letters, digits, periods,
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