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+# These come directly the Modelica 3.3 Spec, Appendix B
+
+## B.1 Lexical Convetions
+
+IDENT = NONDIGIT { DIGIT | NONDIGIT } | Q-IDENT
+Q-IDENT = "’" ( Q-CHAR | S-ESCAPE ) { Q-CHAR | S-ESCAPE } "’"
+NONDIGIT = "_" | letters "a" to "z" | letters "A" to "Z"
+STRING = """ { S-CHAR | S-ESCAPE } """
+S-CHAR = any member of the Unicode character set (http://www.unicode.org; see Section 13.2.2 for storing as UTF-8 on files) except double-quote """, and backslash "\"
+Q-CHAR = NONDIGIT | DIGIT | "!" | "#" | "$" | "%" | "&" | "(" | ")" | "*" | "+" | "," | "-" | "." | "/" | ":" | ";" | "<" | ">" | "=" | "?" | "@" | "[" | "]" | "^" | "{" | "}" | "|" | "~" | " "
+S-ESCAPE = "\’" | "\"" | "\?" | "\\" | "\a" | "\b" | "\f" | "\n" | "\r" | "\t" | "\v"
+DIGIT = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
+UNSIGNED_INTEGER = DIGIT { DIGIT }
+UNSIGNED_NUMBER = UNSIGNED_INTEGER [ "." [ UNSIGNED_INTEGER ] ] [ ( "e" | "E" ) [ "+" | "-" ] UNSIGNED_INTEGER ]
+
+## B.2 Grammar
+
+### B.2.1 
+
+stored_definition:
+    [ within [ name ] ";" ]
+    { [ final ] class_definition ";" }
+
+### B.2.2 Class Definition
+
+class_definition :
+    [ encapsulated ] class_prefixes
+    class_specifier
+
+class_prefixes :
+    [ partial ]
+    ( class | model | [ operator ] record | block | [ expandable ] connector | type |
+    package | [ ( pure | impure ) ] [ operator ] function | operator )
+
+class_specifier :
+    long_class_specifier | short_class_specifier | der_class_specifier
+
+long_class_specifier :
+    IDENT string_comment composition end IDENT
+    | extends IDENT [ class_modification ] string_comment composition
+              end IDENT
+
+short_class_specifier :
+    IDENT "=" base_prefix name [ array_subscripts ]
+    [ class_modification ] comment
+    | IDENT "=" enumeration "(" ( [enum_list] | ":" ) ")" comment
+
+der_class_specifier :
+    IDENT "=" der "(" name "," IDENT { "," IDENT } ")" comment
+
+base_prefix :
+    type_prefix
+
+enum_list :
+    enumeration_literal { "," enumeration_literal}
+
+enumeration_literal :
+    IDENT comment
+
+composition :
+    element_list
+    { public element_list |
+    protected element_list |
+    equation_section |
+    algorithm_section
+    }
+    [ external [ language_specification ]
+    [ external_function_call ] [ annotation ] ";" ]
+    [ annotation ";" ]
+
+language_specification :
+    STRING
+
+external_function_call :
+    [ component_reference "=" ]
+    IDENT "(" [ expression_list ] ")"
+
+element_list :
+    { element ";" }
+
+element :
+    import_clause |
+    extends_clause |
+    [ redeclare ]
+    [ final ]
+    [ inner ] [ outer ]
+    ( ( class_definition | component_clause) |
+    replaceable ( class_definition | component_clause)
+    [constraining_clause comment])
+
+import_clause :
+    import ( IDENT "=" name | name ["." ( "*" | "{" import_list "}" ) ] ) comment
+
+import_list :
+    IDENT { "," IDENT }
+
+### B.2.3 Extends
+
+extends_clause :
+    extends name [ class_modification ] [annotation]
+
+constraining_clause :
+    constrainedby name [ class_modification ]
+
+### B.2.4 Component Clause
+
+component_clause:
+    type_prefix type_specifier [ array_subscripts ] component_list
+    type_prefix :
+    [ flow | stream ]
+    [ discrete | parameter | constant ] [ input | output ]
+
+type_specifier :
+    name
+
+component_list :
+    component_declaration { "," component_declaration }
+
+component_declaration :
+    declaration [ condition_attribute ] comment
+
+condition_attribute:
+    if expression
+
+declaration :
+    IDENT [ array_subscripts ] [ modification ]
+
+### B.2.5 Modification
+
+modification :
+    class_modification [ "=" expression ]
+    | "=" expression
+    | ":=" expression
+
+class_modification :
+    "(" [ argument_list ] ")"
+
+argument_list :
+    argument { "," argument }
+
+argument :
+    element_modification_or_replaceable
+    | element_redeclaration
+    element_modification_or_replaceable:
+    [ each ] [ final ] ( element_modification | element_replaceable)
+
+element_modification :
+    name [ modification ] string_comment
+
+element_redeclaration :
+    redeclare [ each ] [ final ]
+    ( ( short_class_definition | component_clause1) | element_replaceable )
+
+element_replaceable:
+    replaceable ( short_class_definition | component_clause1)
+    [constraining_clause]
+
+component_clause1 :
+    type_prefix type_specifier component_declaration1
+
+component_declaration1 :
+    declaration comment
+
+short_class_definition :
+    class_prefixes short_class_specifier
+
+### B.2.6 Equations
+
+equation_section :
+    [ initial ] equation { equation ";" }
+
+algorithm_section :
+    [ initial ] algorithm { statement ";" }
+
+equation :
+    ( simple_expression "=" expression
+    | if_equation
+    | for_equation
+    | connect_clause
+    | when_equation
+    | name function_call_args )
+    comment
+
+statement :
+    ( component_reference ( ":=" expression | function_call_args )
+    | "(" output_expression_list ")" ":=" component_reference function_call_args
+    | break
+    | return
+    | if_statement
+    | for_statement
+    | while_statement
+    | when_statement )
+    comment
+
+if_equation :
+    if expression then
+      { equation ";" }
+    { elseif expression then
+      { equation ";" }
+    }
+    [ else
+      { equation ";" }
+    ]
+    end if
+
+if_statement :
+    if expression then
+    { statement ";" }
+    { elseif expression then
+    { statement ";" }
+    }
+    [ else
+      { statement ";" }
+    ]
+    end if
+
+for_equation :
+    for for_indices loop
+    { equation ";" }
+    end for
+
+for_statement :
+    for for_indices loop
+    { statement ";" }
+    end for
+
+for_indices :
+    for_index {"," for_index}
+
+for_index:
+    IDENT [ in expression ]
+    while_statement :
+    while expression loop
+    { statement ";" }
+    end while
+
+when_equation :
+    when expression then
+    { equation ";" }
+    { elsewhen expression then
+    { equation ";" } }
+    end when
+
+when_statement :
+    when expression then
+    { statement ";" }
+    { elsewhen expression then
+    { statement ";" } }
+    end when
+
+connect_clause :
+    connect "(" component_reference "," component_reference ")"
+
+### B.2.7 Expressions
+
+expression :
+    simple_expression
+    | if expression then expression { elseif expression then expression }
+    else expression
+
+simple_expression :
+    logical_expression [ ":" logical_expression [ ":" logical_expression ] ]
+
+logical_expression :
+    logical_term { or logical_term }
+
+logical_term :
+    logical_factor { and logical_factor }
+
+logical_factor :
+    [ not ] relation
+
+relation :
+    arithmetic_expression [ rel_op arithmetic_expression ]
+
+rel_op :
+    "<" | "<=" | ">" | ">=" | "==" | "<>"
+
+arithmetic_expression :
+    [ add_op ] term { add_op term }
+
+add_op :
+    "+" | "-" | ".+" | ".-"
+
+term :
+    factor { mul_op factor }
+
+mul_op :
+    "*" | "/" | ".*" | "./"
+
+factor :
+    primary [ ("^" | ".^") primary ]
+
+primary :
+    UNSIGNED_NUMBER
+    | STRING
+    | false
+    | true
+    | ( name | der | initial ) function_call_args
+    | component_reference
+    | "(" output_expression_list ")"
+    | "[" expression_list { ";" expression_list } "]"
+    | "{" function_arguments "}"
+    | end
+
+name :
+    [ "." ] IDENT { "." IDENT }
+
+component_reference :
+    [ "." ] IDENT [ array_subscripts ] { "." IDENT [ array_subscripts ] }
+
+function_call_args :
+    "(" [ function_arguments ] ")"
+    function_arguments :
+    function_argument [ "," function_arguments | for for_indices ]
+    | named_arguments
+
+named_arguments:
+    named_argument [ "," named_arguments ]
+
+named_argument:
+    IDENT "=" function_argument
+
+function_argument :
+    function name "(" [ named_arguments ] ")" | expression
+
+output_expression_list:
+    [ expression ] { "," [ expression ] }
+
+expression_list :
+    expression { "," expression }
+
+array_subscripts :
+    "[" subscript { "," subscript } "]"
+
+subscript :
+    ":" | expression
+
+comment :
+    string_comment [ annotation ]
+
+string_comment :
+    [ STRING { "+" STRING } ]
+
+annotation :
+    annotation class_modification
+