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-.lf 1 ./rcsfile.5in
-.\" Set p to 1 if your formatter can handle pic output.
-.if t .nr p 1
-.de Id
-.ds Rv \\$3
-.ds Dt \\$4
-..
-.Id $Id: rcsfile.5,v 1.1 1996/08/12 04:07:52 millert Exp $
-.ds r \s-1RCS\s0
-.if n .ds - \%--
-.if t .ds - \(em
-.TH RCSFILE 5 \*(Dt GNU
-.SH NAME
-rcsfile \- format of RCS file
-.SH DESCRIPTION
-An \*r file's
-contents are described by the grammar
-below.
-.PP
-The text is free format: space, backspace, tab, newline, vertical
-tab, form feed, and carriage return (collectively,
-.IR "white space")
-have no significance except in strings.
-However, white space cannot appear within an id, num, or sym,
-and an \*r file must end with a newline.
-.PP
-Strings are enclosed by
-.BR @ .
-If a string contains a
-.BR @ ,
-it must be doubled;
-otherwise, strings can contain arbitrary binary data.
-.PP
-The meta syntax uses the following conventions: `|' (bar) separates
-alternatives; `{' and `}' enclose optional phrases; `{' and `}*' enclose
-phrases that can be repeated zero or more times;
-`{' and '}+' enclose phrases that must appear at least once and can be
-repeated;
-Terminal symbols are in
-.BR boldface ;
-nonterminal symbols are in
-.IR italics .
-.LP
-.nr w \w'\f3deltatext\fP '
-.nr y \w'\f3newphrase\fP '
-.if \nw<\ny .nr w \ny
-.nr x \w'\f3branches\fP'
-.nr y \w'{ \f3comment\fP'
-.if \nx<\ny .nr x \ny
-.nr y \w'\f3{ branch\fP'
-.if \nx<\ny .nr x \ny
-.ta \nwu +\w'::=  'u +\nxu+\w'  'u
-.fc #
-.nf
-\f2rcstext\fP	::=	\f2admin\fP {\f2delta\fP}* \f2desc\fP {\f2deltatext\fP}*
-.LP
-\f2admin\fP	::=	\f3head\fP	{\f2num\fP}\f3;\fP
-		{ \f3branch\fP	{\f2num\fP}\f3;\fP }
-		\f3access\fP	{\f2id\fP}*\f3;\fP
-		\f3symbols\fP	{\f2sym\fP \f3:\fP \f2num\fP}*\f3;\fP
-		\f3locks\fP	{\f2id\fP \f3:\fP \f2num\fP}*\f3;\fP  {\f3strict  ;\fP}
-		{ \f3comment\fP	{\f2string\fP}\f3;\fP }
-		{ \f3expand\fP	{\f2string\fP}\f3;\fP }
-		{ \f2newphrase\fP }*
-.LP
-\f2delta\fP	::=	\f2num\fP
-		\f3date\fP	\f2num\fP\f3;\fP
-		\f3author\fP	\f2id\fP\f3;\fP
-		\f3state\fP	{\f2id\fP}\f3;\fP
-		\f3branches\fP	{\f2num\fP}*\f3;\fP
-		\f3next\fP	{\f2num\fP}\f3;\fP
-		{ \f2newphrase\fP }*
-.LP
-\f2desc\fP	::=	\f3desc\fP	\f2string\fP
-.LP
-\f2deltatext\fP	::=	\f2num\fP
-		\f3log\fP	\f2string\fP
-		{ \f2newphrase\fP }*
-		\f3text\fP	\f2string\fP
-.LP
-\f2num\fP	::=	{\f2digit\fP | \f3.\fP}+
-.LP
-\f2digit\fP	::=	\f30\fP | \f31\fP | \f32\fP | \f33\fP | \f34\fP | \f35\fP | \f36\fP | \f37\fP | \f38\fP | \f39\fP
-.LP
-\f2id\fP	::=	{\f2num\fP} \f2idchar\fP {\f2idchar\fP | \f2num\fP}*
-.LP
-\f2sym\fP	::=	{\f2digit\fP}* \f2idchar\fP {\f2idchar\fP | \f2digit\fP}*
-.LP
-\f2idchar\fP	::=	any visible graphic character except \f2special\fP
-.LP
-\f2special\fP	::=	\f3$\fP | \f3,\fP | \f3.\fP | \f3:\fP | \f3;\fP | \f3@\fP
-.LP
-\f2string\fP	::=	\f3@\fP{any character, with \f3@\fP doubled}*\f3@\fP
-.LP
-\f2newphrase\fP	::=	\f2id\fP \f2word\fP* \f3;\fP
-.LP
-\f2word\fP	::=	\f2id\fP | \f2num\fP | \f2string\fP | \f3:\fP
-.fi
-.PP
-Identifiers are case sensitive.  Keywords are in lower case only.
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-In most environments \*r uses the \s-1ISO\s0 8859/1 encoding:
-visible graphic characters are codes 041\-176 and 240\-377,
-and white space characters are codes 010\-015 and 040.
-.PP
-Dates, which appear after the
-.B date
-keyword, are of the form
-\f2Y\fP\f3.\fP\f2mm\fP\f3.\fP\f2dd\fP\f3.\fP\f2hh\fP\f3.\fP\f2mm\fP\f3.\fP\f2ss\fP,
-where
-.I Y
-is the year,
-.I mm
-the month (01\-12),
-.I dd
-the day (01\-31),
-.I hh
-the hour (00\-23),
-.I mm
-the minute (00\-59),
-and
-.I ss
-the second (00\-60).
-.I Y
-contains just the last two digits of the year
-for years from 1900 through 1999,
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-Dates use the Gregorian calendar; times use UTC.
-.PP
-The
-.I newphrase
-productions in the grammar are reserved for future extensions
-to the format of \*r files.
-No
-.I newphrase
-will begin with any keyword already in use.
-.PP
-The
-.I delta
-nodes form a tree.  All nodes whose numbers
-consist of a single pair
-(e.g., 2.3, 2.1, 1.3, etc.)
-are on the trunk, and are linked through the
-.B next
-field in order of decreasing numbers.
-The
-.B head
-field in the
-.I admin
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-the highest pair).
-The
-.B branch
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-branch (or revision) for most \*r operations.
-If empty, the default
-branch is the highest branch on the trunk.
-.PP
-All
-.I delta
-nodes whose numbers consist of
-.RI 2 n
-fields
-.RI ( n \(>=2)
-(e.g., 3.1.1.1, 2.1.2.2, etc.)
-are linked as follows.
-All nodes whose first
-.RI 2 n \-1
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-.B next
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-For each such sequence,
-the
-.I delta
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-.RI 2 n \-2
-number fields of the deltas on that sequence is called the branchpoint.
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-.B branches
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-.LP
-The following diagram shows an example of an \*r file's organization.
-.if !\np \{\
-.nf
-.vs 12
-.ne 36
-.cs 1 20
-.eo
-
-                           Head
-                             |
-                             |
-                             v                        / \
-                         ---------                   /   \
-   / \          / \      |       |      / \         /     \
-  /   \        /   \     |  2.1  |     /   \       /       \
- /     \      /     \    |       |    /     \     /         \
-/1.2.1.3\    /1.3.1.1\   |       |   /1.2.2.2\   /1.2.2.1.1.1\
----------    ---------   ---------   ---------   -------------
-    ^            ^           |           ^             ^
-    |            |           |           |             |
-    |            |           v           |             |
-   / \           |       ---------      / \            |
-  /   \          |       \  1.3  /     /   \           |
- /     \         ---------\     /     /     \-----------
-/1.2.1.1\                  \   /     /1.2.2.1\
----------                   \ /      ---------
-    ^                        |           ^
-    |                        |           |
-    |                        v           |
-    |                    ---------       |
-    |                    \  1.2  /       |
-    ----------------------\     /---------
-                           \   /
-                            \ /
-                             |
-                             |
-                             v
-                         ---------
-                         \  1.1  /
-                          \     /
-                           \   /
-                            \ /
-
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-.PP
-.SH IDENTIFICATION
-.de VL
-\\$2
-..
-Author: Walter F. Tichy,
-Purdue University, West Lafayette, IN, 47907.
-.br
-Manual Page Revision: \*(Rv; Release Date: \*(Dt.
-.br
-Copyright \(co 1982, 1988, 1989 Walter F. Tichy.
-.br
-Copyright \(co 1990, 1991, 1992, 1993, 1994, 1995 Paul Eggert.
-.SH SEE ALSO
-rcsintro(1), ci(1), co(1), ident(1), rcs(1), rcsclean(1), rcsdiff(1),
-rcsmerge(1), rlog(1)
-.br
-Walter F. Tichy,
-\*r\*-A System for Version Control,
-.I "Software\*-Practice & Experience"
-.BR 15 ,
-7 (July 1985), 637-654.