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RCSFILE(5)							    RCSFILE(5)

NAME
       rcsfile - format of RCS file

DESCRIPTION
       An  RCS file is an ASCII file. Its contents is described by the grammar
       below. The text is free format, i.e., spaces, tabs and new  lines  have
       no  significance	 except in strings. Strings are enclosed by `@'.  If a
       string contains a `@', it must be doubled.

       The meta syntax uses the following  conventions:	 `|'  (bar)  separates
       alternatives; `{' and `}' enclose optinal phrases; `{' and `}*' enclose
       phrases that may be repeated zero or more times; `{' and	 '}+'  enclose
       phrases that must appear at least once and may be repeated; `<' and `>'
       enclose nonterminals.

       <rcstext>      ::=  <admin> {<delta>}* <desc> {<deltatext>}*

       <admin>	      ::=  head	     {<num>};
			   access    {<id>}*;
			   symbols   {<id> : <num>}*;
			   locks     {<id> : <num>}*;
			   comment   {<string>};

       <delta>	      ::=  <num>
			   date	     <num>;
			   author    <id>;
			   state     {<id>};
			   branches  {<num>}*;
			   next	     {<num>};

       <desc>	      ::=  desc	     <string>

       <deltatext>    ::=  <num>
			   log	     <string>
			   text	     <string>

       <num>	      ::=  {<digit>{.}}+

       <digit>	      ::=  0 | 1 | ... | 9

       <id>	      ::=  <letter>{<idchar>}*

       <letter>	      ::=  A | B | ... | Z | a | b | ... | z

       <idchar>	      ::=  Any printing ASCII character except space,
			   tab, carriage return, new line, and <special>.

       <special>      ::=  ; | : | , | @

       <string>	      ::=  @{any ASCII character, with `@' doubled}*@

       Identifiers are case sensitive. Keywords are in lower case  only.   The
       sets of keywords and identifiers may overlap.

       The  <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  "next"  field in order of decreasing numbers. The
       "head" field in the <admin> node points to the head  of	that  sequence
       (i.e., contains the highest pair).

       All  <delta>  nodes  whose  numbers  consist  of 2n fields (n≥2) (e.g.,
       3.1.1.1, 2.1.2.2, etc.)	are linked as follows. All nodes  whose	 first
       (2n)-1  number fields are identical are linked through the "next" field
       in order of increasing numbers.	For each such  sequence,  the  <delta>
       node whose number is identical to the first 2(n-1) number fields of the
       deltas on that sequence is  called  the	branchpoint.   The  "branches"
       field  of  a  node contains a list of the numbers of the first nodes of
       all sequences for which it is a branchpoint.  This list is  ordered  in
       increasing numbers.

       Example:
					   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	 /
					  \	/
					   \   /
					    \ /

			       Fig. 1: A revision tree

IDENTIFICATION
       Author: Walter F. Tichy, Purdue University, West Lafayette, IN, 47907.
       Revision Number: 3.0 ; Release Date: 82/11/18 .
       Copyright © 1982 by Walter F. Tichy.

SEE ALSO
       ci (1), co (1), ident (1), rcs (1), rcsdiff (1), rcsintro (1), rcsmerge
       (1), rlog (1), sccstorcs (8).

Purdue University		    6/29/83			    RCSFILE(5)
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