big update to observe, template_binding, polymer

pkg/template_binding/lib/template_binding.dart

Index: pkg/template_binding/lib/template_binding.dart
diff --git a/pkg/template_binding/lib/template_binding.dart b/pkg/template_binding/lib/template_binding.dart
index 61ec19d2570d1113d151105ed107c8b79ff33ce9..512b1e2151a070013579b8a49a92ba99a2d8f29f 100644
--- a/pkg/template_binding/lib/template_binding.dart
+++ b/pkg/template_binding/lib/template_binding.dart
@@ -25,10 +25,8 @@ import 'dart:svg' show SvgSvgElement;
 import 'package:observe/observe.dart';
 
 import 'src/binding_delegate.dart';
-import 'src/node_binding.dart';
 
 export 'src/binding_delegate.dart';
-export 'src/node_binding.dart' show NodeBinding;
 
 part 'src/element.dart';
 part 'src/input_bindings.dart';
@@ -136,6 +134,12 @@ NodeBindExtension nodeBindFallback(Node node) {
 bool _isAttributeTemplate(Element n) => n.attributes.containsKey('template') &&
     _SEMANTIC_TEMPLATE_TAGS.containsKey(n.localName);
 
+bool _isSvgTemplate(Element el) => el.tagName == 'template' &&
+    el.namespaceUri == 'http://www.w3.org/2000/svg';
+
+bool _isHtmlTemplate(Element el) => el.tagName == 'TEMPLATE' &&
+    el.namespaceUri == 'http://www.w3.org/1999/xhtml';
+
 /**
  * Returns true if this node is semantically a template.
  *
@@ -146,7 +150,7 @@ bool _isAttributeTemplate(Element n) => n.attributes.containsKey('template') &&
  * and COL), OPTION, and OPTGROUP.
  */
 bool isSemanticTemplate(Node n) => n is Element &&
-    (n.localName == 'template' || _isAttributeTemplate(n));
+    (_isHtmlTemplate(n) || _isAttributeTemplate(n) || _isSvgTemplate(n));
 
 // TODO(jmesserly): const set would be better
 const _SEMANTIC_TEMPLATE_TAGS = const {