In progress: [Issue 111] Extensions and complete enum literal support
for custom options. 

Fixed scoping for enums in field notations.
diff --git a/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/Protobuf.xtext b/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/Protobuf.xtext
index ca69dd0..f391141 100644
--- a/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/Protobuf.xtext
+++ b/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/Protobuf.xtext
@@ -182,12 +182,12 @@
   '}';
 
 ValueField:
-  SimpleFieldNotation | ComplexFieldNotation;
+  SimpleValueField | ComplexValueField;
 
-SimpleFieldNotation:
+SimpleValueField:
   name=FieldName ':' value=SimpleValueLink;
 
-ComplexFieldNotation:
+ComplexValueField:
   name=FieldName ':'? values=ComplexValue;
 
 FieldName:
diff --git a/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/scoping/FieldNotationScopeFinder.java b/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/scoping/FieldNotationScopeFinder.java
index 2269594..dd22fc3 100644
--- a/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/scoping/FieldNotationScopeFinder.java
+++ b/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/scoping/FieldNotationScopeFinder.java
@@ -55,16 +55,15 @@
         CustomFieldOption option = (CustomFieldOption) container;
         source = fieldOptions.sourceOf(option);
       }
-      if (container instanceof ComplexFieldNotation) {
-        ComplexFieldNotation complex = (ComplexFieldNotation) container;
-        return sourceOf(complex);
+      if (container instanceof ComplexValueField) {
+        return sourceOf((ComplexValueField) container);
       }
     }
     return ((source instanceof MessageField) ? (MessageField) source : null);
   }
 
-  private MessageField sourceOf(ComplexFieldNotation n) {
-    FieldName name = n.getName();
+  private MessageField sourceOf(ComplexValueField field) {
+    FieldName name = field.getName();
     return (name == null) ? null : name.getTarget();
   }
   
diff --git a/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/scoping/ProtobufScopeProvider.java b/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/scoping/ProtobufScopeProvider.java
index 60460a0..0450f8b 100644
--- a/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/scoping/ProtobufScopeProvider.java
+++ b/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/scoping/ProtobufScopeProvider.java
@@ -103,6 +103,10 @@
       CustomFieldOption option = (CustomFieldOption) container;
       container = fieldOptions.sourceOf(option);
     }
+    if (container instanceof SimpleValueField) {
+      SimpleValueField field = (SimpleValueField) container;
+      container = field.getName().getTarget();
+    }
     if (container instanceof MessageField) {
       anEnum = modelFinder.enumTypeOf((MessageField) container);
     }