diff --git a/modules/angular2/src/core/compiler/compiler.ts b/modules/angular2/src/core/compiler/compiler.ts
index 737a0717c8..4305c2693e 100644
--- a/modules/angular2/src/core/compiler/compiler.ts
+++ b/modules/angular2/src/core/compiler/compiler.ts
@@ -161,8 +161,7 @@ export class Compiler {
     var protoView = protoViews[0];
     // TODO(tbosch): we should be caching host protoViews as well!
     // -> need a separate cache for this...
-    if (renderPv.type === renderApi.ProtoViewDto.COMPONENT_VIEW_TYPE &&
-        isPresent(componentBinding)) {
+    if (renderPv.type === renderApi.ViewType.COMPONENT && isPresent(componentBinding)) {
       // Populate the cache before compiling the nested components,
       // so that components can reference themselves in their template.
       var component = componentBinding.key.token;
diff --git a/modules/angular2/src/core/compiler/proto_view_factory.ts b/modules/angular2/src/core/compiler/proto_view_factory.ts
index b55cb69a76..51a836d961 100644
--- a/modules/angular2/src/core/compiler/proto_view_factory.ts
+++ b/modules/angular2/src/core/compiler/proto_view_factory.ts
@@ -222,10 +222,10 @@ function _getChangeDetectorDefinitions(
         bindingRecordsCreator.getDirectiveRecords(elementBinders, allRenderDirectiveMetadata);
     var strategyName = DEFAULT;
     var typeString;
-    if (pvWithIndex.renderProtoView.type === renderApi.ProtoViewDto.COMPONENT_VIEW_TYPE) {
+    if (pvWithIndex.renderProtoView.type === renderApi.ViewType.COMPONENT) {
       strategyName = hostComponentMetadata.changeDetection;
       typeString = 'comp';
-    } else if (pvWithIndex.renderProtoView.type === renderApi.ProtoViewDto.HOST_VIEW_TYPE) {
+    } else if (pvWithIndex.renderProtoView.type === renderApi.ViewType.HOST) {
       typeString = 'host';
     } else {
       typeString = 'embedded';
diff --git a/modules/angular2/src/render/api.ts b/modules/angular2/src/render/api.ts
index 4b8e0f6b1d..fb38f4a204 100644
--- a/modules/angular2/src/render/api.ts
+++ b/modules/angular2/src/render/api.ts
@@ -92,28 +92,29 @@ export class DirectiveBinder {
   }
 }
 
-export class ProtoViewDto {
-  // A view that contains the host element with bound
-  // component directive.
-  // Contains a view of type #COMPONENT_VIEW_TYPE.
-  static get HOST_VIEW_TYPE() { return 0; }
+export enum ViewType {
+  // A view that contains the host element with bound component directive.
+  // Contains a COMPONENT view
+  HOST,
   // The view of the component
-  // Can contain 0 to n views of type #EMBEDDED_VIEW_TYPE
-  static get COMPONENT_VIEW_TYPE() { return 1; }
+  // Can contain 0 to n EMBEDDED views
+  COMPONENT,
   // A view that is embedded into another View via a <template> element
-  // inside of a component view
-  static get EMBEDDED_VIEW_TYPE() { return 2; }
+  // inside of a COMPONENT view
+  EMBEDDED
+}
 
+export class ProtoViewDto {
   render: RenderProtoViewRef;
   elementBinders: List<ElementBinder>;
   variableBindings: Map<string, string>;
-  type: number;
+  type: ViewType;
 
   constructor({render, elementBinders, variableBindings, type}: {
     render?: RenderProtoViewRef,
     elementBinders?: List<ElementBinder>,
     variableBindings?: Map<string, string>,
-    type?: number
+    type?: ViewType
   }) {
     this.render = render;
     this.elementBinders = elementBinders;
diff --git a/modules/angular2/src/render/dom/compiler/compile_pipeline.ts b/modules/angular2/src/render/dom/compiler/compile_pipeline.ts
index 36783edf20..87fc86cd47 100644
--- a/modules/angular2/src/render/dom/compiler/compile_pipeline.ts
+++ b/modules/angular2/src/render/dom/compiler/compile_pipeline.ts
@@ -5,7 +5,7 @@ import {CompileElement} from './compile_element';
 import {CompileControl} from './compile_control';
 import {CompileStep} from './compile_step';
 import {ProtoViewBuilder} from '../view/proto_view_builder';
-import {ProtoViewDto} from '../../api';
+import {ProtoViewDto, ViewType} from '../../api';
 
 /**
  * CompilePipeline for executing CompileSteps recursively for
@@ -15,10 +15,10 @@ export class CompilePipeline {
   _control: CompileControl;
   constructor(steps: List<CompileStep>) { this._control = new CompileControl(steps); }
 
-  process(rootElement, protoViewType: number = null,
+  process(rootElement, protoViewType: ViewType = null,
           compilationCtxtDescription: string = ''): List<CompileElement> {
     if (isBlank(protoViewType)) {
-      protoViewType = ProtoViewDto.COMPONENT_VIEW_TYPE;
+      protoViewType = ViewType.COMPONENT;
     }
     var results = ListWrapper.create();
     var rootCompileElement = new CompileElement(rootElement, compilationCtxtDescription);
diff --git a/modules/angular2/src/render/dom/compiler/compiler.ts b/modules/angular2/src/render/dom/compiler/compiler.ts
index 1648197029..86d66ed985 100644
--- a/modules/angular2/src/render/dom/compiler/compiler.ts
+++ b/modules/angular2/src/render/dom/compiler/compiler.ts
@@ -7,6 +7,7 @@ import {DOM} from 'angular2/src/dom/dom_adapter';
 import {
   ViewDefinition,
   ProtoViewDto,
+  ViewType,
   DirectiveMetadata,
   RenderCompiler,
   RenderProtoViewRef
@@ -38,8 +39,7 @@ export class DomCompiler extends RenderCompiler {
   compile(template: ViewDefinition): Promise<ProtoViewDto> {
     var tplPromise = this._templateLoader.load(template);
     return PromiseWrapper.then(
-        tplPromise, (el) => this._compileTemplate(template, el, ProtoViewDto.COMPONENT_VIEW_TYPE),
-        (e) => {
+        tplPromise, (el) => this._compileTemplate(template, el, ViewType.COMPONENT), (e) => {
           throw new BaseException(
               `Failed to load the template for "${template.componentId}" : ${e}`);
         });
@@ -52,11 +52,11 @@ export class DomCompiler extends RenderCompiler {
       directives: [directiveMetadata]
     });
     var element = DOM.createElement(directiveMetadata.selector);
-    return this._compileTemplate(hostViewDef, element, ProtoViewDto.HOST_VIEW_TYPE);
+    return this._compileTemplate(hostViewDef, element, ViewType.HOST);
   }
 
   _compileTemplate(viewDef: ViewDefinition, tplElement,
-                   protoViewType: number): Promise<ProtoViewDto> {
+                   protoViewType: ViewType): Promise<ProtoViewDto> {
     var subTaskPromises = [];
     var pipeline = new CompilePipeline(this._stepFactory.createSteps(viewDef, subTaskPromises));
     var compileElements = pipeline.process(tplElement, protoViewType, viewDef.componentId);
diff --git a/modules/angular2/src/render/dom/view/proto_view_builder.ts b/modules/angular2/src/render/dom/view/proto_view_builder.ts
index 81be08538d..d2fee7ce8f 100644
--- a/modules/angular2/src/render/dom/view/proto_view_builder.ts
+++ b/modules/angular2/src/render/dom/view/proto_view_builder.ts
@@ -23,7 +23,7 @@ export class ProtoViewBuilder {
   variableBindings: Map<string, string> = MapWrapper.create();
   elements: List<ElementBinderBuilder> = [];
 
-  constructor(public rootElement, public type: number) {}
+  constructor(public rootElement, public type: api.ViewType) {}
 
   bindElement(element, description = null): ElementBinderBuilder {
     var builder = new ElementBinderBuilder(this.elements.length, element, description);
@@ -187,7 +187,7 @@ export class ElementBinderBuilder {
     if (isPresent(this.nestedProtoView)) {
       throw new BaseException('Only one nested view per element is allowed');
     }
-    this.nestedProtoView = new ProtoViewBuilder(rootElement, api.ProtoViewDto.EMBEDDED_VIEW_TYPE);
+    this.nestedProtoView = new ProtoViewBuilder(rootElement, api.ViewType.EMBEDDED);
     return this.nestedProtoView;
   }
 
diff --git a/modules/angular2/src/transform/template_compiler/generator.dart b/modules/angular2/src/transform/template_compiler/generator.dart
index 1fa3c78e16..e22266bad9 100644
--- a/modules/angular2/src/transform/template_compiler/generator.dart
+++ b/modules/angular2/src/transform/template_compiler/generator.dart
@@ -101,7 +101,7 @@ class _TemplateExtractor {
         new CompilePipeline(_factory.createSteps(viewDef, subtaskPromises));
 
     var compileElements = pipeline.process(
-        templateEl, ProtoViewDto.COMPONENT_VIEW_TYPE, viewDef.componentId);
+        templateEl, ViewType.COMPONENT, viewDef.componentId);
     var protoViewDto = compileElements[0].inheritedProtoView
         .build(new PropertySetterFactory());
 
diff --git a/modules/angular2/test/core/compiler/compiler_spec.ts b/modules/angular2/test/core/compiler/compiler_spec.ts
index 87e0c6e93d..674f90773b 100644
--- a/modules/angular2/test/core/compiler/compiler_spec.ts
+++ b/modules/angular2/test/core/compiler/compiler_spec.ts
@@ -317,7 +317,7 @@ export function main() {
            createRenderProtoView([
              createRenderViewportElementBinder(
                  createRenderProtoView([createRenderComponentElementBinder(0)],
-                                       renderApi.ProtoViewDto.EMBEDDED_VIEW_TYPE))
+                                       renderApi.ViewType.EMBEDDED))
            ]),
            createRenderProtoView()
          ],
@@ -379,7 +379,7 @@ export function main() {
          renderCompiler.spy('compileHost')
              .andCallFake((componentId) => {
                return PromiseWrapper.resolve(createRenderProtoView(
-                   [createRenderComponentElementBinder(0)], renderApi.ProtoViewDto.HOST_VIEW_TYPE));
+                   [createRenderComponentElementBinder(0)], renderApi.ViewType.HOST));
              });
          tplResolver.setView(MainComponent, new viewAnn.View({template: '<div></div>'}));
          var rootProtoView =
@@ -429,9 +429,9 @@ function createViewportElementBinder(nestedProtoView) {
   return elBinder;
 }
 
-function createRenderProtoView(elementBinders = null, type: number = null) {
+function createRenderProtoView(elementBinders = null, type: renderApi.ViewType = null) {
   if (isBlank(type)) {
-    type = renderApi.ProtoViewDto.COMPONENT_VIEW_TYPE;
+    type = renderApi.ViewType.COMPONENT;
   }
   if (isBlank(elementBinders)) {
     elementBinders = [];
diff --git a/modules/angular2/test/core/compiler/proto_view_factory_spec.ts b/modules/angular2/test/core/compiler/proto_view_factory_spec.ts
index 31c55cdc70..ce84060f2f 100644
--- a/modules/angular2/test/core/compiler/proto_view_factory_spec.ts
+++ b/modules/angular2/test/core/compiler/proto_view_factory_spec.ts
@@ -146,9 +146,9 @@ function directiveBinding({metadata}: {metadata?: any} = {}) {
   return new DirectiveBinding(Key.get("dummy"), null, [], false, [], [], [], metadata);
 }
 
-function createRenderProtoView(elementBinders = null, type: number = null) {
+function createRenderProtoView(elementBinders = null, type: renderApi.ViewType = null) {
   if (isBlank(type)) {
-    type = renderApi.ProtoViewDto.COMPONENT_VIEW_TYPE;
+    type = renderApi.ViewType.COMPONENT;
   }
   if (isBlank(elementBinders)) {
     elementBinders = [];
diff --git a/modules/angular2/test/render/dom/compiler/compiler_common_tests.ts b/modules/angular2/test/render/dom/compiler/compiler_common_tests.ts
index ec9107808b..4fd1074f1d 100644
--- a/modules/angular2/test/render/dom/compiler/compiler_common_tests.ts
+++ b/modules/angular2/test/render/dom/compiler/compiler_common_tests.ts
@@ -17,7 +17,7 @@ import {Type, isBlank, stringify, isPresent} from 'angular2/src/facade/lang';
 import {PromiseWrapper, Promise} from 'angular2/src/facade/async';
 
 import {DomCompiler} from 'angular2/src/render/dom/compiler/compiler';
-import {ProtoViewDto, ViewDefinition, DirectiveMetadata} from 'angular2/src/render/api';
+import {ProtoViewDto, ViewDefinition, DirectiveMetadata, ViewType} from 'angular2/src/render/api';
 import {CompileElement} from 'angular2/src/render/dom/compiler/compile_element';
 import {CompileStep} from 'angular2/src/render/dom/compiler/compile_step';
 import {CompileStepFactory} from 'angular2/src/render/dom/compiler/compile_step_factory';
@@ -140,7 +140,7 @@ export function runCompilerCommonTests() {
            compiler.compile(
                        new ViewDefinition({componentId: 'someId', template: 'inline component'}))
                .then((protoView) => {
-                 expect(protoView.type).toEqual(ProtoViewDto.COMPONENT_VIEW_TYPE);
+                 expect(protoView.type).toEqual(ViewType.COMPONENT);
                  async.done();
                });
          }));
@@ -154,7 +154,7 @@ export function runCompilerCommonTests() {
            var compiler = createCompiler(EMPTY_STEP);
            compiler.compileHost(someComponent)
                .then((protoView) => {
-                 expect(protoView.type).toEqual(ProtoViewDto.HOST_VIEW_TYPE);
+                 expect(protoView.type).toEqual(ViewType.HOST);
                  async.done();
                });
          }));
diff --git a/modules/angular2/test/render/dom/compiler/pipeline_spec.ts b/modules/angular2/test/render/dom/compiler/pipeline_spec.ts
index a0c748a8d0..1600941ed4 100644
--- a/modules/angular2/test/render/dom/compiler/pipeline_spec.ts
+++ b/modules/angular2/test/render/dom/compiler/pipeline_spec.ts
@@ -9,7 +9,7 @@ import {CompileStep} from 'angular2/src/render/dom/compiler/compile_step';
 import {CompileControl} from 'angular2/src/render/dom/compiler/compile_control';
 
 import {ProtoViewBuilder} from 'angular2/src/render/dom/view/proto_view_builder';
-import {ProtoViewDto} from 'angular2/src/render/api';
+import {ProtoViewDto, ViewType} from 'angular2/src/render/api';
 
 export function main() {
   describe('compile_pipeline', () => {
@@ -43,7 +43,7 @@ export function main() {
         new MockStep((parent, current, control) => {
           if (isPresent(DOM.getAttribute(current.element, 'viewroot'))) {
             current.inheritedProtoView =
-                new ProtoViewBuilder(current.element, ProtoViewDto.EMBEDDED_VIEW_TYPE);
+                new ProtoViewBuilder(current.element, ViewType.EMBEDDED);
           }
         })
       ]);
diff --git a/modules/angular2/test/render/dom/compiler/view_splitter_spec.ts b/modules/angular2/test/render/dom/compiler/view_splitter_spec.ts
index bc0178544b..5838ecb31e 100644
--- a/modules/angular2/test/render/dom/compiler/view_splitter_spec.ts
+++ b/modules/angular2/test/render/dom/compiler/view_splitter_spec.ts
@@ -12,7 +12,7 @@ import {MapWrapper} from 'angular2/src/facade/collection';
 
 import {ViewSplitter} from 'angular2/src/render/dom/compiler/view_splitter';
 import {CompilePipeline} from 'angular2/src/render/dom/compiler/compile_pipeline';
-import {ProtoViewDto} from 'angular2/src/render/api';
+import {ProtoViewDto, ViewType} from 'angular2/src/render/api';
 import {DOM} from 'angular2/src/dom/dom_adapter';
 
 import {Lexer, Parser} from 'angular2/change_detection';
@@ -68,7 +68,7 @@ export function main() {
         expect(results[2].inheritedProtoView).not.toBe(null);
         expect(results[2].inheritedProtoView)
             .toBe(results[1].inheritedElementBinder.nestedProtoView);
-        expect(results[2].inheritedProtoView.type).toBe(ProtoViewDto.EMBEDDED_VIEW_TYPE);
+        expect(results[2].inheritedProtoView.type).toBe(ViewType.EMBEDDED);
         expect(stringifyElement(results[2].inheritedProtoView.rootElement))
             .toEqual('<template>a</template>');
       });