// specify your DSL grammar rules here ...
// IMPORTANT: You should change the property 'overwrite.pluginresources=true' in the properties file to 'overwrite.pluginresources=false' AFTER first generation

Model:
	(uses+=Using)*
	(package=Package);

Using:
	"using" name=ID ";"
;

Package:
 "package" name=ID "{"
 (types+=Type)*
 "}";
 
Type:
	BasicType | Association;
	
BasicType:
	DataType | Entity ;
	
DataType:
"datatype" name=ID ";";

Entity:
 (basic?="basic")? "entity" name=ID ("extends" supertype=[Entity])? "{"
(features+=Feature | Choice)*
"}";

Feature:
 (identifier?="identifier")? type=[BasicType|ID] (multiplicity?="[1..n]" | "[0..n]" | "[0..1]")? name=ID ";";

Choice:
	"choice" "{"
		(features+=Feature)
	"}";

Association:
	"association" 	(isNavigable?="navigable")? 
					(containment?="aggregate" | "composite")? 
					(multiplicity?="[1..1]" | "[1..n]" | "[n..m]" | "[0..1]" | "[0..n]")? 
					fromEntity=ID "," toEntity=ID ("extends" supertype=[Entity]) ";";