a bit more moving around

diff --git a/pkgs/markdown/lib/src/ast.dart b/pkgs/markdown/lib/src/ast.dart
index 6a05021..befd75e 100644
--- a/pkgs/markdown/lib/src/ast.dart
+++ b/pkgs/markdown/lib/src/ast.dart

@@ -2,7 +2,9 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library markdown.core;
+library markdown.ast;
+
+typedef Node Resolver(String name);
 
 /// Base class for any AST item. Roughly corresponds to Node in the DOM. Will
 /// be either an Element or Text.

diff --git a/pkgs/markdown/lib/src/document.dart b/pkgs/markdown/lib/src/document.dart
index b1c1db3..7ed01ca 100644
--- a/pkgs/markdown/lib/src/document.dart
+++ b/pkgs/markdown/lib/src/document.dart

@@ -3,7 +3,6 @@
 import 'ast.dart';
 import 'block_parser.dart';
 import 'inline_parser.dart';
-import 'util.dart';
 
 /// Maintains the context needed to parse a markdown document.
 class Document {

diff --git a/pkgs/markdown/lib/src/util.dart b/pkgs/markdown/lib/src/util.dart
index 2d577a6..a6d52de 100644
--- a/pkgs/markdown/lib/src/util.dart
+++ b/pkgs/markdown/lib/src/util.dart

@@ -1,12 +1,8 @@
 library markdown.util;
 
-import 'ast.dart';
-
 /// Replaces `<`, `&`, and `>`, with their HTML entity equivalents.
 String escapeHtml(String html) {
   return html.replaceAll('&', '&amp;')
              .replaceAll('<', '&lt;')
              .replaceAll('>', '&gt;');
 }
-
-typedef Node Resolver(String name);