Model:
	entities+=Entity*
	uses+=Use*
	;

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

Attribute:
	name=ID
;

Use:
	"use" var=Var "{"
		"whatever" varref=[Var] "." attr=[Attribute]
	"}"
;

Var:
	entity=[Entity] "as" name=ID
;

 */
class MyDslScopeProvider extends org.eclipse.xtext.scoping.impl.AbstractDeclarativeScopeProvider {

	def IScope scope_Use_attr(Use ctx, EReference ref) {
		return Scopes::scopeFor(ctx.varref.entity.attributes)
	}
	def IScope scope_Use_varref(Use ctx, EReference ref) {
		return Scopes::scopeFor(newArrayList(ctx.^var))
	}

}