+ URL: one of the above URL format
+ Push: <refspec>...
+ Pull: <refspec>...
+
+ When such a short-hand is specified in place of
+ <repository> without <refspec> parameters on the command
+ line, <refspec>... specified on Push lines or Pull lines
+ are used for "git push" and "git fetch/pull",
+ respectively.
+
+ The name of a file in $GIT_DIR/branches directory can be
+ specified as an older notation short-hand; the named
+ file should contain a single line, a URL in one of the
+ above formats, optionally followed by a hash '#' and the
+ name of remote head (URL fragment notation).
+ $GIT_DIR/branches/<remote> file that stores a <url>
+ without the fragment is equivalent to have this in the
+ corresponding file in the $GIT_DIR/remotes/ directory
+
+ URL: <url>
+ Pull: refs/heads/master:<remote>
+
+ while having <url>#<head> is equivalent to
+
+ URL: <url>
+ Pull: refs/heads/<head>:<remote>
+
+<refspec>::
+ The canonical format of a <refspec> parameter is
+ +?<src>:<dst>; that is, an optional plus '+', followed
+ by the source ref, followed by a colon ':', followed by
+ the destination ref.
+
+ When used in "git push", the <src> side can be an
+ arbitrary "SHA1 expression" that can be used as an
+ argument to "git-cat-file -t". E.g. "master~4" (push
+ four parents before the current master head).
+
+ For "git push", the local ref that matches <src> is used
+ to fast forward the remote ref that matches <dst>. If
+ the optional plus '+' is used, the remote ref is updated
+ even if it does not result in a fast forward update.
+
+ For "git fetch/pull", the remote ref that matches <src>
+ is fetched, and if <dst> is not empty string, the local
+ ref that matches it is fast forwarded using <src>.
+ Again, if the optional plus '+' is used, the local ref
+ is updated even if it does not result in a fast forward
+ update.
+
+ Some short-cut notations are also supported.
+
+ * For backward compatibility, "tag" is almost ignored;
+ it just makes the following parameter <tag> to mean a
+ refspec "refs/tags/<tag>:refs/tags/<tag>".
+
+ * A parameter <ref> without a colon is equivalent to
+ <ref>: when pulling/fetching, and <ref>:<ref> when
+ pushing. That is, do not store it locally if
+ fetching, and update the same name if pushing.