diff --git a/packages/core/src/render3/di.ts b/packages/core/src/render3/di.ts
index 168507bdb5..4cc09c5b2d 100644
--- a/packages/core/src/render3/di.ts
+++ b/packages/core/src/render3/di.ts
@@ -262,7 +262,7 @@ export function injectAttribute(attrNameToInject: string): string|undefined {
     for (let i = 0; i < attrs.length; i = i + 2) {
       let attrName = attrs[i];
       if (attrName === AttributeMarker.SELECT_ONLY) break;
-      if (attrName === AttributeMarker.NAMESPACE_URI) {
+      if (attrName === 0) {  // NS.FULL
         attrName = attrs[i += 2];
       }
       if (attrName == attrNameToInject) {
diff --git a/packages/core/src/render3/instructions.ts b/packages/core/src/render3/instructions.ts
index f6fad80f48..30fcc1fe80 100644
--- a/packages/core/src/render3/instructions.ts
+++ b/packages/core/src/render3/instructions.ts
@@ -843,7 +843,8 @@ function setUpAttributes(native: RElement, attrs: TAttributes): void {
   const isProc = isProceduralRenderer(renderer);
   for (let i = 0; i < attrs.length; i += 2) {
     let attrName = attrs[i];
-    if (attrName === AttributeMarker.NAMESPACE_URI) {
+    if (attrName === 0) {  // NS.FULL
+      // Namespaced attribute
       const attrNS = attrs[i + 1] as string;
       attrName = attrs[i + 2] as string;
       const attrVal = attrs[i + 3] as string;
@@ -1515,7 +1516,7 @@ function generateInitialInputs(
   const attrs = tNode.attrs !;
   for (let i = 0; i < attrs.length; i += 2) {
     const first = attrs[i];
-    const attrName = first === AttributeMarker.NAMESPACE_URI ? attrs[i += 2] : first;
+    const attrName = first === 0 ? attrs[i += 2] : first;  // 0 = NS.FULL
     const minifiedInputName = inputs[attrName];
     const attrValue = attrs[i + 1];
 
diff --git a/packages/core/src/render3/interfaces/node.ts b/packages/core/src/render3/interfaces/node.ts
index 2f3ac9585a..00ea8220a7 100644
--- a/packages/core/src/render3/interfaces/node.ts
+++ b/packages/core/src/render3/interfaces/node.ts
@@ -12,6 +12,18 @@ import {LQueries} from './query';
 import {RElement, RNode, RText} from './renderer';
 import {LView, TData, TView} from './view';
 
+
+/**
+ * Namespace attribute flags.
+ */
+export const enum NS {
+  /**
+   * Use the next value as the full namespaces URI, the values after that
+   * are then the name and the value, respectively.
+   */
+  FULL = 0,
+}
+
 /**
  * TNodeType corresponds to the TNode.type property. It contains information
  * on how to map a particular set of bits in LNode.flags to the node type.
@@ -160,11 +172,7 @@ export interface LProjectionNode extends LNode {
  * items are not regular attributes and the processing should be adapted accordingly.
  */
 export const enum AttributeMarker {
-  /**
-   * Use the next value as the full namespaces URI, the values after that
-   * are then the name and the value, respectively.
-   */
-  NAMESPACE_URI = 0,  // namespace. Has to be repeated.
+  NS = 0,  // namespace. Has to be repeated.
 
   /**
    * This marker indicates that the following attribute names were extracted from bindings (ex.:
@@ -180,7 +188,7 @@ export const enum AttributeMarker {
  * - attribute names and values
  * - special markers acting as flags to alter attributes processing.
  */
-export type TAttributes = (string | AttributeMarker)[];
+export type TAttributes = (string | AttributeMarker | NS)[];
 
 /**
  * LNode binding data (flyweight) for a particular node that is shared between all templates
diff --git a/packages/core/src/render3/node_selector_matcher.ts b/packages/core/src/render3/node_selector_matcher.ts
index 354ff7317f..efba0295ee 100644
--- a/packages/core/src/render3/node_selector_matcher.ts
+++ b/packages/core/src/render3/node_selector_matcher.ts
@@ -107,7 +107,8 @@ function findAttrIndexInNode(name: string, attrs: TAttributes | null): number {
   if (attrs === null) return -1;
   for (let i = 0; i < attrs.length; i += step) {
     const attrName = attrs[i];
-    if (attrName === AttributeMarker.NAMESPACE_URI) {
+    if (attrName === 0) {
+      // NS.FULL
       step = 2;
     } else if (attrName === name) {
       return i;
diff --git a/packages/core/test/render3/instructions_spec.ts b/packages/core/test/render3/instructions_spec.ts
index b7e79be99d..237744cee4 100644
--- a/packages/core/test/render3/instructions_spec.ts
+++ b/packages/core/test/render3/instructions_spec.ts
@@ -11,7 +11,7 @@ import {NgForOfContext} from '@angular/common';
 import {RenderFlags, directiveInject} from '../../src/render3';
 import {defineComponent} from '../../src/render3/definition';
 import {bind, container, element, elementAttribute, elementClass, elementEnd, elementProperty, elementStart, elementStyle, elementStyleNamed, interpolation1, renderTemplate, setHtmlNS, setSvgNS, text, textBinding} from '../../src/render3/instructions';
-import {AttributeMarker, LElementNode, LNode} from '../../src/render3/interfaces/node';
+import {LElementNode, LNode, NS} from '../../src/render3/interfaces/node';
 import {RElement, domRendererFactory3} from '../../src/render3/interfaces/renderer';
 import {TrustedString, bypassSanitizationTrustHtml, bypassSanitizationTrustResourceUrl, bypassSanitizationTrustScript, bypassSanitizationTrustStyle, bypassSanitizationTrustUrl, sanitizeHtml, sanitizeResourceUrl, sanitizeScript, sanitizeStyle, sanitizeUrl} from '../../src/sanitization/sanitization';
 import {Sanitizer, SecurityContext} from '../../src/sanitization/security';
@@ -95,7 +95,7 @@ describe('instructions', () => {
     it('should use sanitizer function even on elements with namespaced attributes', () => {
       const t = new TemplateFixture(() => {
         element(0, 'div', [
-          AttributeMarker.NAMESPACE_URI,
+          NS.FULL,
           'http://www.example.com/2004/test',
           'whatever',
           'abc',
@@ -445,7 +445,7 @@ describe('instructions', () => {
           'height',
           '300',
           // test:title="abc"
-          AttributeMarker.NAMESPACE_URI,
+          NS.FULL,
           'http://www.example.com/2014/test',
           'title',
           'abc',
@@ -472,7 +472,7 @@ describe('instructions', () => {
           'id',
           'container',
           // test:title="abc"
-          AttributeMarker.NAMESPACE_URI,
+          NS.FULL,
           'http://www.example.com/2014/test',
           'title',
           'abc',
@@ -492,7 +492,7 @@ describe('instructions', () => {
           'container',
 
           // NS1:title="abc"
-          AttributeMarker.NAMESPACE_URI,
+          NS.FULL,
           'http://www.example.com/2014/test',
           'title',
           'abc',
@@ -502,13 +502,13 @@ describe('instructions', () => {
           'background: #dead11',
 
           // NS1:whatever="wee"
-          AttributeMarker.NAMESPACE_URI,
+          NS.FULL,
           'http://www.example.com/2014/test',
           'whatever',
           'wee',
 
           // NS2:shazbot="wocka wocka"
-          AttributeMarker.NAMESPACE_URI,
+          NS.FULL,
           'http://www.whatever.com/2016/blah',
           'shazbot',
           'wocka wocka',