diff --git a/CHANGELOG.md b/CHANGELOG.md
index 22fc34f..9a6eccf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# 1.2.1
+
+* Many members on `Style` that provided access to patterns and functions used
+  internally for parsing paths have been deprecated.
+
 # 1.2.0
 
 * Added `path.prettyUri`, which produces a human-readable representation of a
diff --git a/lib/src/context.dart b/lib/src/context.dart
index 88ca61f..f3826d7 100644
--- a/lib/src/context.dart
+++ b/lib/src/context.dart
@@ -4,6 +4,7 @@
 
 library path.context;
 
+import 'internal_style.dart';
 import 'style.dart';
 import 'parsed_path.dart';
 import 'path_exception.dart';
@@ -30,7 +31,12 @@
       }
     }
 
-    if (style == null) style = Style.platform;
+    if (style == null) {
+      style = Style.platform;
+    } else if (style is! InternalStyle) {
+      throw new ArgumentError("Only styles defined by the path package are "
+          "allowed.");
+    }
 
     return new Context._(style, current);
   }
@@ -38,7 +44,7 @@
   Context._(this.style, this.current);
 
   /// The style of path that this context works with.
-  final Style style;
+  final InternalStyle style;
 
   /// The current directory that relative paths will be relative to.
   final String current;
diff --git a/lib/src/internal_style.dart b/lib/src/internal_style.dart
new file mode 100644
index 0000000..13fb57e
--- /dev/null
+++ b/lib/src/internal_style.dart
@@ -0,0 +1,75 @@
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// 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 path.internal_style;
+
+import 'context.dart';
+import 'style.dart';
+
+/// The internal interface for the [Style] type.
+///
+/// Users should be able to pass around instances of [Style] like an enum, but
+/// the members that [Context] uses should be hidden from them. Those members
+/// are defined on this class instead.
+abstract class InternalStyle extends Style {
+  /// The path separator for this style. On POSIX, this is `/`. On Windows,
+  /// it's `\`.
+  String get separator;
+
+  /// The [Pattern] that can be used to match a separator for a path in this
+  /// style. Windows allows both "/" and "\" as path separators even though "\"
+  /// is the canonical one.
+  Pattern get separatorPattern;
+
+  /// The [Pattern] that matches path components that need a separator after
+  /// them.
+  ///
+  /// Windows and POSIX styles just need separators when the previous component
+  /// doesn't already end in a separator, but the URL always needs to place a
+  /// separator between the root and the first component, even if the root
+  /// already ends in a separator character. For example, to join "file://" and
+  /// "usr", an additional "/" is needed (making "file:///usr").
+  Pattern get needsSeparatorPattern;
+
+  /// The [Pattern] that can be used to match the root prefix of an absolute
+  /// path in this style.
+  Pattern get rootPattern;
+
+  /// The [Pattern] that can be used to match the root prefix of a root-relative
+  /// path in this style.
+  ///
+  /// This can be null to indicate that this style doesn't support root-relative
+  /// paths.
+  final Pattern relativeRootPattern = null;
+
+  /// Gets the root prefix of [path] if path is absolute. If [path] is relative,
+  /// returns `null`.
+  String getRoot(String path) {
+    // TODO(rnystrom): Use firstMatch() when #7080 is fixed.
+    var matches = rootPattern.allMatches(path);
+    if (matches.isNotEmpty) return matches.first[0];
+    return getRelativeRoot(path);
+  }
+
+  /// Gets the root prefix of [path] if it's root-relative.
+  ///
+  /// If [path] is relative or absolute and not root-relative, returns `null`.
+  String getRelativeRoot(String path) {
+    if (relativeRootPattern == null) return null;
+    // TODO(rnystrom): Use firstMatch() when #7080 is fixed.
+    var matches = relativeRootPattern.allMatches(path);
+    if (matches.isEmpty) return null;
+    return matches.first[0];
+  }
+
+  /// Returns the path represented by [uri] in this style.
+  String pathFromUri(Uri uri);
+
+  /// Returns the URI that represents the relative path made of [parts].
+  Uri relativePathToUri(String path) =>
+      new Uri(pathSegments: context.split(path));
+
+  /// Returns the URI that represents [path], which is assumed to be absolute.
+  Uri absolutePathToUri(String path);
+}
diff --git a/lib/src/parsed_path.dart b/lib/src/parsed_path.dart
index 5356b44..3f3c3b9 100644
--- a/lib/src/parsed_path.dart
+++ b/lib/src/parsed_path.dart
@@ -4,12 +4,12 @@
 
 library path.parsed_path;
 
+import 'internal_style.dart';
 import 'style.dart';
 
-// TODO(rnystrom): Make this public?
 class ParsedPath {
-  /// The [Style] that was used to parse this path.
-  Style style;
+  /// The [InternalStyle] that was used to parse this path.
+  InternalStyle style;
 
   /// The absolute root portion of the path, or `null` if the path is relative.
   /// On POSIX systems, this will be `null` or "/". On Windows, it can be
@@ -40,7 +40,7 @@
   /// `true` if this is an absolute path.
   bool get isAbsolute => root != null;
 
-  factory ParsedPath.parse(String path, Style style) {
+  factory ParsedPath.parse(String path, InternalStyle style) {
     var before = path;
 
     // Remove the root prefix, if any.
diff --git a/lib/src/style.dart b/lib/src/style.dart
index 9da4b43..a94ec68 100644
--- a/lib/src/style.dart
+++ b/lib/src/style.dart
@@ -51,67 +51,37 @@
   /// The name of this path style. Will be "posix" or "windows".
   String get name;
 
-  /// The path separator for this style. On POSIX, this is `/`. On Windows,
-  /// it's `\`.
-  String get separator;
-
-  /// The [Pattern] that can be used to match a separator for a path in this
-  /// style. Windows allows both "/" and "\" as path separators even though "\"
-  /// is the canonical one.
-  Pattern get separatorPattern;
-
-  /// The [Pattern] that matches path components that need a separator after
-  /// them.
-  ///
-  /// Windows and POSIX styles just need separators when the previous component
-  /// doesn't already end in a separator, but the URL always needs to place a
-  /// separator between the root and the first component, even if the root
-  /// already ends in a separator character. For example, to join "file://" and
-  /// "usr", an additional "/" is needed (making "file:///usr").
-  Pattern get needsSeparatorPattern;
-
-  /// The [Pattern] that can be used to match the root prefix of an absolute
-  /// path in this style.
-  Pattern get rootPattern;
-
-  /// The [Pattern] that can be used to match the root prefix of a root-relative
-  /// path in this style.
-  ///
-  /// This can be null to indicate that this style doesn't support root-relative
-  /// paths.
-  final Pattern relativeRootPattern = null;
-
   /// A [Context] that uses this style.
   Context get context => new Context(style: this);
 
-  /// Gets the root prefix of [path] if path is absolute. If [path] is relative,
-  /// returns `null`.
-  String getRoot(String path) {
-    // TODO(rnystrom): Use firstMatch() when #7080 is fixed.
-    var matches = rootPattern.allMatches(path);
-    if (matches.isNotEmpty) return matches.first[0];
-    return getRelativeRoot(path);
-  }
+  @Deprecated("Most Style members will be removed in path 2.0.")
+  String get separator;
 
-  /// Gets the root prefix of [path] if it's root-relative.
-  ///
-  /// If [path] is relative or absolute and not root-relative, returns `null`.
-  String getRelativeRoot(String path) {
-    if (relativeRootPattern == null) return null;
-    // TODO(rnystrom): Use firstMatch() when #7080 is fixed.
-    var matches = relativeRootPattern.allMatches(path);
-    if (matches.isEmpty) return null;
-    return matches.first[0];
-  }
+  @Deprecated("Most Style members will be removed in path 2.0.")
+  Pattern get separatorPattern;
 
-  /// Returns the path represented by [uri] in this style.
+  @Deprecated("Most Style members will be removed in path 2.0.")
+  Pattern get needsSeparatorPattern;
+
+  @Deprecated("Most Style members will be removed in path 2.0.")
+  Pattern get rootPattern;
+
+  @Deprecated("Most Style members will be removed in path 2.0.")
+  Pattern get relativeRootPattern;
+
+  @Deprecated("Most style members will be removed in path 2.0.")
+  String getRoot(String path);
+
+  @Deprecated("Most style members will be removed in path 2.0.")
+  String getRelativeRoot(String path);
+
+  @Deprecated("Most style members will be removed in path 2.0.")
   String pathFromUri(Uri uri);
 
-  /// Returns the URI that represents the relative path made of [parts].
-  Uri relativePathToUri(String path) =>
-      new Uri(pathSegments: context.split(path));
+  @Deprecated("Most style members will be removed in path 2.0.")
+  Uri relativePathToUri(String path);
 
-  /// Returns the URI that represents [path], which is assumed to be absolute.
+  @Deprecated("Most style members will be removed in path 2.0.")
   Uri absolutePathToUri(String path);
 
   String toString() => name;
diff --git a/lib/src/style/posix.dart b/lib/src/style/posix.dart
index 72e7044..e0b6017 100644
--- a/lib/src/style/posix.dart
+++ b/lib/src/style/posix.dart
@@ -5,10 +5,10 @@
 library path.style.posix;
 
 import '../parsed_path.dart';
-import '../style.dart';
+import '../internal_style.dart';
 
 /// The style for POSIX paths.
-class PosixStyle extends Style {
+class PosixStyle extends InternalStyle {
   PosixStyle();
 
   final name = 'posix';
diff --git a/lib/src/style/url.dart b/lib/src/style/url.dart
index 4a7003d..1e84917 100644
--- a/lib/src/style/url.dart
+++ b/lib/src/style/url.dart
@@ -4,10 +4,10 @@
 
 library path.style.url;
 
-import '../style.dart';
+import '../internal_style.dart';
 
 /// The style for URL paths.
-class UrlStyle extends Style {
+class UrlStyle extends InternalStyle {
   UrlStyle();
 
   final name = 'url';
diff --git a/lib/src/style/windows.dart b/lib/src/style/windows.dart
index 1750578..be9f45f 100644
--- a/lib/src/style/windows.dart
+++ b/lib/src/style/windows.dart
@@ -5,10 +5,10 @@
 library path.style.windows;
 
 import '../parsed_path.dart';
-import '../style.dart';
+import '../internal_style.dart';
 
 /// The style for Windows paths.
-class WindowsStyle extends Style {
+class WindowsStyle extends InternalStyle {
   WindowsStyle();
 
   final name = 'windows';
diff --git a/pubspec.yaml b/pubspec.yaml
index f21ac50..86e7d95 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: path
-version: 1.2.0
+version: 1.2.1-dev
 author: Dart Team <misc@dartlang.org>
 description: >
  A string-based path manipulation library. All of the path operations you know