brown:	Signal Keyword or required character(s) (in a Signal program, Signal Keywords can appear either totally in lower case or totally in upper case)
[ elements ]:	elements between square brackets are optional elements
{ elements }:	elements between these braces denore possibly empty list of such elements
set1 \ set2:	denotes any element obtained from set1, which is not an element obtained from set2

MODULE ::=
        module Name-module = [ DIRECTIVES ] DECLARATION { DECLARATION } end ;

DECLARATION ::=
        MODEL
        | DECLARATION-OF-TYPES
        | DECLARATION-OF-CONSTANTS
        | S-DECLARATION
        | DECLARATION-OF-SHARED-VARIABLES
        | DECLARATION-OF-STATE-VARIABLES
        | DECLARATION-OF-LABELS
        | IMPORT-OF-MODULES
        | REFERENCES

IMPORT-OF-MODULES ::=
        use IMPORTED-OBJECTS { , IMPORTED-OBJECTS } ;

IMPORTED-OBJECTS ::=
        Name-module

MODEL ::=
        PROCESS
        | ACTION
        | PROCEDURE
        | AUTOMATON
        | NODE
        | FUNCTION

PROCESS ::=
        process Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;
        | private process Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;

ACTION ::=
        action Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;
        | private action Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;

PROCEDURE ::=
        procedure Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;
        | private procedure Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;

AUTOMATON ::=
        automaton Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;
        | private automaton Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;

NODE ::=
        node Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;
        | private node Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;

FUNCTION ::=
        function Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;
        | private function Name-model = DEFINITION-OF-INTERFACE [ DIRECTIVES ] [ BODY ] ;

DEFINITION-OF-INTERFACE ::=
        INTERFACE
        | Name-model-type

INTERFACE ::=
        [ PARAMETERS ] ( INPUTS OUTPUTS ) EXTERNAL-GRAPH

PARAMETERS ::=
        { { FORMAL-PARAMETER } }

FORMAL-PARAMETER ::=
        S-DECLARATION
        | DECLARATION-OF-TYPES
        | FORMAL-MODEL

FORMAL-MODEL ::=
        process Name-model-type Name-model
        | action Name-model-type Name-model
        | procedure Name-model-type Name-model
        | automaton Name-model-type Name-model
        | node Name-model-type Name-model
        | function Name-model-type Name-model

INPUTS ::=
        ? { S-DECLARATION }

OUTPUTS ::=
        ! { S-DECLARATION }

EXTERNAL-GRAPH ::=
        [ PROCESS-ATTRIBUTE ] [ SPECIFICATION-OF-PROPERTIES ]

PROCESS-ATTRIBUTE ::=
        safe
        | deterministic
        | unsafe

SPECIFICATION-OF-PROPERTIES ::=
        spec GENERAL-PROCESS

DIRECTIVES ::=
        pragmas PRAGMA { PRAGMA } end pragmas

PRAGMA ::=
        Name-pragma [ { PRAGMA-OBJECT { , PRAGMA-OBJECT } ] [ Pragma-statement ]

PRAGMA-OBJECT ::=
        Label
        | Name

Pragma-statement ::=
        String-cst

BODY ::=
        DESCRIPTION-OF-MODEL

DESCRIPTION-OF-MODEL ::=
        GENERAL-PROCESS
        | EXTERNAL-NOTATION

EXTERNAL-NOTATION ::=
        external [ String-cst ]

DECLARATION-BLOCK ::=
        where DECLARATION { DECLARATION } end

DECLARATION-OF-TYPES ::=
        type DEFINITION-OF-TYPE { , DEFINITION-OF-TYPE } ;
        | private type DEFINITION-OF-TYPE { , DEFINITION-OF-TYPE } ;

DEFINITION-OF-TYPE ::=
        Name-type
        | Name-type = DESCRIPTION-OF-TYPE
        | process Name-model-type = DEFINITION-OF-INTERFACE [ DIRECTIVES ]
        | action Name-model-type = DEFINITION-OF-INTERFACE [ DIRECTIVES ]
        | procedure Name-model-type = DEFINITION-OF-INTERFACE [ DIRECTIVES ]
        | automaton Name-model-type = DEFINITION-OF-INTERFACE [ DIRECTIVES ]
        | node Name-model-type = DEFINITION-OF-INTERFACE [ DIRECTIVES ]
        | function Name-model-type = DEFINITION-OF-INTERFACE [ DIRECTIVES ]

DESCRIPTION-OF-TYPE ::=
        SIGNAL-TYPE
        | EXTERNAL-NOTATION [ TYPE-INITIAL-VALUE ]

TYPE-INITIAL-VALUE ::=
        init Name-constant

SIGNAL-TYPE ::=
        Scalar-type
        | External-type
        | ENUMERATED-TYPE
        | ARRAY-TYPE
        | TUPLE-TYPE
        | Name-type

Scalar-type ::=
        Synchronization-type
        | Numeric-type
        | Alphabetic-type

Synchronization-type ::=
        event
        | boolean

Numeric-type ::=
        Integer-type
        | Real-type
        | Complex-type

Integer-type ::=
        short
        | integer
        | long

Real-type ::=
        real
        | dreal

Complex-type ::=
        complex
        | dcomplex

Alphabetic-type ::=
        char
        | string

External-type ::=
        Name-type

ENUMERATED-TYPE ::=
        enum ( Name-enum-value { , Name-enum-value } )

ARRAY-TYPE ::=
        [ S-EXPR { , S-EXPR } ] SIGNAL-TYPE

TUPLE-TYPE ::=
        struct ( NAMED-FIELDS )
        | bundle ( NAMED-FIELDS ) [ SPECIFICATION-OF-PROPERTIES ]

NAMED-FIELDS ::=
        S-DECLARATION { S-DECLARATION }

DECLARATION-OF-CONSTANTS ::=
        constant SIGNAL-TYPE DEFINITION-OF-CONSTANT { , DEFINITION-OF-CONSTANT } ;
        | constant DEFINITION-OF-CONSTANT { , DEFINITION-OF-CONSTANT } ;
        | private constant SIGNAL-TYPE DEFINITION-OF-CONSTANT { , DEFINITION-OF-CONSTANT } ;
        | private constant DEFINITION-OF-CONSTANT { , DEFINITION-OF-CONSTANT } ;

DEFINITION-OF-CONSTANT ::=
        Name-constant
        | Name-constant = DESCRIPTION-OF-CONSTANT

DESCRIPTION-OF-CONSTANT ::=
        S-EXPR
        | EXTERNAL-NOTATION

S-DECLARATION ::=
        SIGNAL-TYPE DEFINITION-OF-SEQUENCE { , DEFINITION-OF-SEQUENCE } ;
        | DEFINITION-OF-SEQUENCE { , DEFINITION-OF-SEQUENCE } ;

DEFINITION-OF-SEQUENCE ::=
        Name-signal
        | Name-signal init S-EXPR

DECLARATION-OF-SHARED-VARIABLES ::=
        shared SIGNAL-TYPE DEFINITION-OF-SEQUENCE { , DEFINITION-OF-SEQUENCE } ;
        | shared DEFINITION-OF-SEQUENCE { , DEFINITION-OF-SEQUENCE } ;

DECLARATION-OF-STATE-VARIABLES ::=
        statevar SIGNAL-TYPE DEFINITION-OF-SEQUENCE { , DEFINITION-OF-SEQUENCE } ;
        | statevar DEFINITION-OF-SEQUENCE { , DEFINITION-OF-SEQUENCE } ;

DECLARATION-OF-LABELS ::=
        label Name-label { , Name-label } ;

REFERENCES ::=
        ref Name-signal { , Name-signal } ;

P-EXPR ::=
        GENERAL-PROCESS
        | ELEMENTARY-PROCESS
        | LABELLED-PROCESS
        | HIDING

GENERAL-PROCESS ::=
        CONFINED-PROCESS
        | COMPOSITION
        | SEQUENTIAL-COMPOSITION
        | CHOICE-PROCESS
        | ITERATION-OF-PROCESSES

ELEMENTARY-PROCESS ::=
        INSTANCE-OF-PROCESS
        | DEFINITION-OF-SIGNALS
        | CONSTRAINT
        | DEPENDENCES

LABELLED-PROCESS ::=
        Label :: P-EXPR
        | on S-EXPR :: P-EXPR

Label ::=
        Name

HIDING ::=
        GENERAL-PROCESS / Name-signal { , Name-signal }
        | HIDING / Name-signal { , Name-signal }

CONFINED-PROCESS ::=
        GENERAL-PROCESS DECLARATION-BLOCK

COMPOSITION ::=
        (| [ P-EXPR { | P-EXPR } ] |)

SEQUENTIAL-COMPOSITION ::=
        (; P-EXPR { ; P-EXPR } ;)

CHOICE-PROCESS ::=
        case S-EXPR in CASE { CASE } [ ELSE-CASE ] end

CASE ::=
        ENUMERATION-OF-VALUES : GENERAL-PROCESS

ELSE-CASE ::=
        else GENERAL-PROCESS

ENUMERATION-OF-VALUES ::=
        { S-EXPR { , S-EXPR } }
        | [. [ S-EXPR ] , [ S-EXPR ] .]
        | [. [ S-EXPR ] , [ S-EXPR ] [.
        | .] [ S-EXPR ] , [ S-EXPR ] .]
        | .] [ S-EXPR ] , [ S-EXPR ] [.

ITERATION-OF-PROCESSES ::=
        array ARRAY-INDEX of P-EXPR [ ITERATION-INIT ] end
        | iterate ITERATION-INDEX of P-EXPR [ ITERATION-INIT ] end

ARRAY-INDEX ::=
        Name to S-EXPR

ITERATION-INDEX ::=
        DEFINED-ELEMENT
        | ( DEFINED-ELEMENT { , DEFINED-ELEMENT } )
        | S-EXPR

ITERATION-INIT ::=
        with P-EXPR

INSTANCE-OF-PROCESS ::=
        EXPANSION
        | Name-model ( )
        | PRODUCTION

EXPANSION ::=
        Name-model { S-EXPR-PARAMETER { , S-EXPR-PARAMETER } }

PRODUCTION ::=
        MODEL-REFERENCE ( S-EXPR { , S-EXPR } )

MODEL-REFERENCE ::=
        EXPANSION
        | Name-model

S-EXPR-PARAMETER ::=
        S-EXPR
        | SIGNAL-TYPE
        | Name-model

DEFINITION-OF-SIGNALS ::=
        DEFINED-ELEMENT := S-EXPR
        | ( DEFINED-ELEMENT { , DEFINED-ELEMENT } ) := S-EXPR
        | DEFINED-ELEMENT ::= S-EXPR
        | ( DEFINED-ELEMENT { , DEFINED-ELEMENT } ) ::= S-EXPR
        | DEFINED-ELEMENT ::= defaultvalue S-EXPR
        | ( DEFINED-ELEMENT { , DEFINED-ELEMENT } ) ::= defaultvalue S-EXPR

DEFINED-ELEMENT ::=
        COMPONENT
        | COMPONENT [ S-EXPR { , S-EXPR } ]

COMPONENT ::=
        Name-signal
        | Name-signal . COMPONENT

CONSTRAINT ::=
        S-EXPR { ^= S-EXPR }
        | S-EXPR { ^< S-EXPR }
        | S-EXPR { ^> S-EXPR }
        | S-EXPR { ^# S-EXPR }
        | S-EXPR :=: S-EXPR

DEPENDENCES ::=
        SIGNALS { --> SIGNALS }
        | { SIGNALS --> SIGNALS } when S-EXPR

SIGNALS ::=
        ELEMENTARY-SIGNAL
        | { ELEMENTARY-SIGNAL { , ELEMENTARY-SIGNAL } }

ELEMENTARY-SIGNAL ::=
        DEFINED-ELEMENT
        | Label

S-EXPR ::=
        INSTANCE-OF-PROCESS
        | CONVERSION
        | S-EXPR-DYNAMIC
        | S-EXPR-TEMPORAL
        | S-EXPR-CLOCK
        | S-EXPR-BOOLEAN
        | S-EXPR-ARITHMETIC
        | S-EXPR-CONDITION
        | S-EXPR-TUPLE
        | S-EXPR-ARRAY
        | S-EXPR-ELEMENTARY
        | S-EXPR \\ S-EXPR
        | ( S-EXPR )

CONVERSION ::=
        Type-conversion ( S-EXPR )

Type-conversion ::=
        Scalar-type
        | Name-type

S-EXPR-DYNAMIC ::=
        SIMPLE-DELAY
        | WINDOW
        | GENERALIZED-DELAY

SIMPLE-DELAY ::=
        S-EXPR $ [ init S-EXPR ]

WINDOW ::=
        S-EXPR window S-EXPR [ init S-EXPR ]

GENERALIZED-DELAY ::=
        S-EXPR $ S-EXPR [ init S-EXPR ]

S-EXPR-TEMPORAL ::=
        MERGING
        | EXTRACTION
        | MEMORIZATION
        | VARIABLE
        | COUNTER

MERGING ::=
        S-EXPR default S-EXPR

EXTRACTION ::=
        S-EXPR when S-EXPR

MEMORIZATION ::=
        S-EXPR cell S-EXPR [ init S-EXPR ]

VARIABLE ::=
        var S-EXPR [ init S-EXPR ]

COUNTER ::=
        S-EXPR after S-EXPR
        | S-EXPR from S-EXPR
        | S-EXPR count S-EXPR

S-EXPR-CLOCK ::=
        SIGNAL-CLOCK
        | CLOCK-EXTRACTION
        | ^0
        | S-EXPR ^+ S-EXPR
        | S-EXPR ^- S-EXPR
        | S-EXPR ^* S-EXPR

SIGNAL-CLOCK ::=
        ^ S-EXPR

CLOCK-EXTRACTION ::=
        when S-EXPR
        | [: S-EXPR ]
        | [/: S-EXPR ]

S-EXPR-BOOLEAN ::=
        not S-EXPR
        | S-EXPR or S-EXPR
        | S-EXPR and S-EXPR
        | S-EXPR xor S-EXPR
        | RELATION

RELATION ::=
        S-EXPR = S-EXPR
        | S-EXPR /= S-EXPR
        | S-EXPR > S-EXPR
        | S-EXPR >= S-EXPR
        | S-EXPR < S-EXPR
        | S-EXPR <= S-EXPR
        | S-EXPR == S-EXPR
        | S-EXPR <<= S-EXPR

S-EXPR-ARITHMETIC ::=
        S-EXPR + S-EXPR
        | S-EXPR - S-EXPR
        | S-EXPR * S-EXPR
        | S-EXPR / S-EXPR
        | S-EXPR modulo S-EXPR
        | S-EXPR ** S-EXPR
        | + S-EXPR
        | - S-EXPR
        | DENOTATION-OF-COMPLEX

DENOTATION-OF-COMPLEX ::=
        S-EXPR @ S-EXPR

S-EXPR-CONDITION ::=
        if S-EXPR then S-EXPR else S-EXPR

S-EXPR-TUPLE ::=
        TUPLE-ENUMERATION
        | TUPLE-FIELD

TUPLE-ENUMERATION ::=
        ( S-EXPR { , S-EXPR } )

TUPLE-FIELD ::=
        S-EXPR . Name-field

S-EXPR-ARRAY ::=
        ARRAY-ENUMERATION
        | CONCATENATION
        | ITERATIVE-ENUMERATION
        | INDEX
        | MULTI-INDEX
        | ARRAY-ELEMENT
        | SUB-ARRAY
        | ARRAY-RESTRUCTURATION
        | SEQUENTIAL-DEFINITION
        | TRANSPOSITION
        | ARRAY-PRODUCT
        | REFERENCE-SEQUENCE

ARRAY-ENUMERATION ::=
        [ S-EXPR { , S-EXPR } ]

CONCATENATION ::=
        S-EXPR |+ S-EXPR

ITERATIVE-ENUMERATION ::=
        S-EXPR |* S-EXPR
        | [ ITERATION { , PARTIAL-DEFINITION } ]

PARTIAL-DEFINITION ::=
        DEFINITION-OF-ELEMENT
        | ITERATION

DEFINITION-OF-ELEMENT ::=
        [ S-EXPR { , S-EXPR } ] : S-EXPR

ITERATION ::=
        { PARTIAL-ITERATION { , PARTIAL-ITERATION } } : DEFINITION-OF-ELEMENT
        | { PARTIAL-ITERATION { , PARTIAL-ITERATION } } : S-EXPR

PARTIAL-ITERATION ::=
        [ Name ] [ in S-EXPR ] [ to S-EXPR ] [ step S-EXPR ]

INDEX ::=
        S-EXPR .. S-EXPR [ step S-EXPR ]

MULTI-INDEX ::=
        << S-EXPR { , S-EXPR } >>

ARRAY-ELEMENT ::=
        S-EXPR [ S-EXPR { , S-EXPR } ]
        | S-EXPR [ S-EXPR { , S-EXPR } ] ARRAY-RECOVERY

ARRAY-RECOVERY ::=
        \\ S-EXPR

SUB-ARRAY ::=
        S-EXPR [ S-EXPR { , S-EXPR } ]

ARRAY-RESTRUCTURATION ::=
        S-EXPR : S-EXPR

SEQUENTIAL-DEFINITION ::=
        S-EXPR next S-EXPR

TRANSPOSITION ::=
        tr S-EXPR

ARRAY-PRODUCT ::=
        S-EXPR *. S-EXPR

REFERENCE-SEQUENCE ::=
        S-EXPR [ ? ]

S-EXPR-ELEMENTARY ::=
        CONSTANT
        | Name-signal
        | Label
        | Name-state-variable ?

CONSTANT ::=
        ENUM-CST
        | Boolean-cst
        | Integer-cst
        | Real-cst
        | Character-cst
        | String-cst

ENUM-CST ::=
        # Name-enum-value
        | Name-type # Name-enum-value

Boolean-cst ::=
        true
        | false

Integer-cst ::=
        numeral-char { numeral-char }

Real-cst ::=
        Simple-precision-real-cst
        | Double-precision-real-cst

Simple-precision-real-cst ::=
        Integer-cst Simple-precision-exponent
        | Integer-cst . Integer-cst [ Simple-precision-exponent ]

Double-precision-real-cst ::=
        Integer-cst Double-precision-exponent
        | Integer-cst . Integer-cst Double-precision-exponent

Simple-precision-exponent ::=
        e Relative-cst
        | E Relative-cst

Double-precision-exponent ::=
        d Relative-cst
        | D Relative-cst

Relative-cst ::=
        Integer-cst
        | + Integer-cst
        | - Integer-cst

Character-cst ::=
        ' Character-cstCharacter '

Character-cstCharacter ::=
        Character \ character-spec-char

character-spec-char ::=
        '
        | long-separator

String-cst ::=
        " { String-cstCharacter } "

String-cstCharacter ::=
        Character \ string-spec-char

string-spec-char ::=
        "
        | long-separator

Name ::=
        begin-name-char { name-char }

begin-name-char ::=
        name-char \ numeral-char

name-char ::=
        letter-char
        | numeral-char
        | _

letter-char ::=
        upper-case-letter-char
        | lower-case-letter-char
        | other-letter-char

upper-case-letter-char ::=
        A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

lower-case-letter-char ::=
        a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z

other-letter-char ::=
        À | Á | Â | Ã | Ä | Å | Æ | Ç | È | É | Ê | Ë | Ì | Í | Î | Ï | Ð | Ñ | Ò | Ó | Ô | Õ | Ö | Ø | Ù | Ú | Û | Ü | Ý | Þ | ß
        | à | á | â | ã | ä | å | æ | ç | è | é | ê | ë | ì | í | î | ï | ð | ñ | ò | ó | ô | õ | ö | ø | ù | ú | û | ü | ý | þ | ÿ

numeral-char ::=
        0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

Comment ::=
        % { CommentCharacter } %

CommentCharacter ::=
        Character \ comment-spec-char

comment-spec-char ::=
        %

Character ::=
        character
        | CharacterCode

character ::=
        name-char
        | mark
        | delimitor
        | separator
        | other-character

mark ::=
        . | ' | " | % | : | = | < | > | + | - | * | / | @ | $ | ^ | # | | | \

delimitor ::=
        ( | ) | { | } | [ | ] | ? | ! | , | ;

separator ::=
        \x20
        | long-separator

long-separator ::=
        \x9 | \xA | \xC | \xD

CharacterCode ::=
        OctalCode
        | HexadecimalCode
        | escape-code

OctalCode ::=
        \ octal-char [ octal-char [ octal-char ] ]

octal-char ::=
        0 | 1 | 2 | 3 | 4 | 5 | 6 | 7

HexadecimalCode ::=
        \x hexadecimal-char [ hexadecimal-char ]

hexadecimal-char ::=
        numeral-char
        | A | B | C | D | E | F | a | b | c | d | e | f

escape-code ::=
        \a | \b | \f | \n | \r | \t | \v | \\ | \" | \' | \? | \%

prefix-mark ::=
        \