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EBNF (Extended Backus Normal Form) description of the format of the tags
file created by etags.c and interpreted by etags.el
Francesco Potorti` <pot@gnu.org> 2002
================================================================
FF ::= #x0c /* form feed */
LF ::= #x0a /* line feed */
PATTERM ::= #x80 /* pattern terminator */
NAMTERM ::= #x01 /* name terminator */
regchar ::= [^#x0a#x0c#x80] /* regular character */
regstring ::= { regchar } /* regular string */
unsint ::= [0-9] { [0-9] } /* non-negative integer */
tagfile ::= { tagsection } /* a tags file */
tagsection ::= FF LF ( includesec | regularsec ) LF
includesec ::= filename ",include" [ LF fileprop ]
regularsec ::= filename "," [ unsint ] [ LF fileprop ] { LF tag }
filename ::= regchar regstring /* a file name */
fileprop ::= PATTERM "(" regstring ")"
tag ::= directtag | patterntag
directtag ::= PATTERM realposition
patterntag ::= pattern PATTERM [ tagname NAMTERM ] position
pattern ::= regstring /* a tag pattern */
tagname ::= regchar regstring /* a tag name */
position ::= realposition | ","
realposition ::= "," unsint | unsint "," | unsint "," unsint
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