File:
  'package' name=QualifiedName ';'

  (types += Type)*
;

Import:
  'import' importedNamespace=QualifiedNameWithWildcard ';'
;

Type:
  'type' name=ID (':' baseTypes += [Type|QualifiedName] (',' baseTypes += [Type|QualifiedName])*)? ';'
;

package a.b.c;

type FirstType;

package d.e.f;

type SecondType : a.b.c.FirstType;

package g.h.i;

import a.b.c.*;

type ThirdType : FirstType;

package a.b.c;

type FourthType : FirstType; // Couldn't resolve reference to Type 'FirstType'

package org.xtext.example.mydsl.scoping;

import java.util.List;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.xtext.scoping.impl.ImportNormalizer;
import org.eclipse.xtext.scoping.impl.ImportedNamespaceAwareLocalScopeProvider;
import org.xtext.example.mydsl.myDsl.File;

public class MyDslImportedNamespaceAwareLocalScopeProvider extends ImportedNamespaceAwareLocalScopeProvider {

	@Override
	protected List<ImportNormalizer> getImportedNamespaceResolvers(EObject context, boolean ignoreCase) {
		 List<ImportNormalizer> importedNamespaceResolvers = super.getImportedNamespaceResolvers(context, ignoreCase);
		 if (context instanceof File) {
			 importedNamespaceResolvers.add(doCreateImportNormalizer(getQualifiedNameConverter().toQualifiedName(((File) context).getName()), true, ignoreCase));
		 }
		 return importedNamespaceResolvers;
	}
	
}

class MyDslRuntimeModule extends AbstractMyDslRuntimeModule {
	
	override void configureIScopeProviderDelegate(Binder binder) {
		binder.bind(IScopeProvider).annotatedWith(Names.named(AbstractDeclarativeScopeProvider.NAMED_DELEGATE)).to(
			MyDslImportedNamespaceAwareLocalScopeProvider)
	}
	
}