MyModel:
	(imports+=Import)*
	(entities+=Entity)*;

Import:
	'import' importURI=STRING;

Entity:
	'entity' name=ID ('extends' extends=[Entity|ID])?;

	private val names = new HashMap<String, Set<String>>

	@Check
	def checkUniquenessAcrossFiles(MyModel model) {
		names.remove(model.eResource.URI.toString)

		val modelNames = new HashSet<String>
		model.entities.forEach[e|modelNames.add(e.name)]
		names.put(model.eResource.URI.toString, modelNames)
		val allNames = new HashSet<String>
		names.forEach [ k, v |
			v.forEach [ name |
				if (allNames.contains(name)) {
					error("Entity name should be unique", model, MyDSLPackage.Literals.MY_MODEL__ENTITIES)
				} else {
					allNames.add(name)
				}
			]
		]
	}

entity Base