Short_ID: 
	  Feature_Declaration
	| Attribute
	| Constant;

Short_IDTail: 
	  Short_ID
	| Shared_Feature
	| Sub_Attribute;

Long_ID: 
	  head=[Short_ID] (tail=(Long_IDTail))?
	| keyword=Shortcut   tail=Long_IDTail;

Long_IDTail: 
	  '.' head=[Short_IDTail] (tail=Long_IDTail)?;


Root_Feature: 'root' name=ID body=Feature_Content;

Hierarchical_Feature: optional?=('opt')? name=ID body=Feature_Content?;

Feature_Declaration: Root_Feature | Hierarchical_Feature;

Attribute:
	  Base_Attribute
	| {Structure_Attribute} type=[Record] name=ID '{' sub_attributes+=Sub_Attribute+ '}';
	
Base_Attribute:
	  type='int' name=ID attr_body=Attribute_Body? ';'
	| type='real' name=ID attr_body=Attribute_Body? ';'
	| type='bool' name=ID attr_body=Attribute_Body? ';'
	| type='enum' name=ID  'in' '{' domain=Enum_List '}'  ( 'is' attr_value=Expression	| ',' attr_condition=Attribute_Conditionnal)? ';'
	| predefined_type=[SimpleType|ID] name=ID attr_body=Attribute_Body? ';';


Enum_List: enums+=Enum_Element (',' enums+=Enum_Element)*;

Enum_Element: name=ID;

Expression:
	 ...
	| ref=Long_ID
        | elt=[Enum_Element];