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..97daeabad53b7e1dffa7ae95c3eebf90c1d848d5 100644
--- a/pkg/template_binding/lib/template_binding.dart
+++ b/pkg/template_binding/lib/template_binding.dart
@@ -25,10 +25,9 @@ import 'dart:svg' show SvgSvgElement;
 import 'package:observe/observe.dart';
 
 import 'src/binding_delegate.dart';
-import 'src/node_binding.dart';
+import 'src/mustache_tokens.dart';
 
 export 'src/binding_delegate.dart';
-export 'src/node_binding.dart' show NodeBinding;
 
 part 'src/element.dart';
 part 'src/input_bindings.dart';
@@ -45,6 +44,8 @@ part 'src/text_area_element.dart';
 // two packages, but this is not easy when we are faking extension methods.
 // Since TemplateElement needs to override Node.bind, it seems like the
 // Node.bind layer must have some innate knowledge of TemplateBinding.
+// NOTE: I've heard NodeBind might become an internal API, which is all the more
+// reason to have it in this package.
 
 /**
  * Provides access to the data binding APIs for the [node]. For example:
@@ -136,6 +137,12 @@ 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 +153,7 @@ 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 {