Model:
	entities+=Entity
	instances+=Instance
;

Entity:
	"entity" name=ID "{"
		attributes+=Attribute*
	"}"
;

Attribute:
	name=ID ":" type=Type 
;

enum Type :
	string | int | Boolean
;

Instance:
	"instance" name=ID ":" type=[Entity] "{"
		attributeInstances+=AttributeInstance*
	"}"
;

AttributeInstance:
	attribute=[Attribute] "=" value=Literal //or expression 
;

Literal:
	IntLiteral | StringLiteral | BooleanLiteral
;

IntLiteral:
	value=INT
;

StringLiteral:
	value=STRING
;

BooleanLiteral:
	{BooleanLiteral}"false" |(value?="true")
;