diff --git a/.travis.yml b/.travis.yml
index f271211..054b078 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,7 @@
 language: objective-c
+osx_image: xcode7
 before_install:
 - gem install cocoapods --no-document
 script:
+- swiftc Nest.swift
 - pod lib lint
diff --git a/Nest.podspec b/Nest.podspec
index 0634b33..eaaada5 100644
--- a/Nest.podspec
+++ b/Nest.podspec
@@ -1,12 +1,12 @@
 Pod::Spec.new do |spec|
   spec.name = 'Nest'
-  spec.version = '0.1.0'
+  spec.version = '0.2.0'
   spec.summary = 'Swift Web Server Gateway Interface.'
   spec.homepage = 'https://github.com/nestproject/'
   spec.license = { :type => 'BSD', :file => 'LICENSE' }
   spec.author = { 'Kyle Fuller' => 'kyle@fuller.li' }
   spec.social_media_url = 'http://twitter.com/kylefuller'
-  spec.source = { :git => 'https://github.com/nestproject/Nest.git', :tag => "#{spec.version}" }
+  spec.source = { :git => 'https://github.com/nestproject/Nest.git', :tag => spec.version }
   spec.source_files = 'Nest.swift'
   spec.requires_arc = true
   spec.ios.deployment_target = '8.0'
diff --git a/Nest.swift b/Nest.swift
index ee7d83f..0c3c822 100644
--- a/Nest.swift
+++ b/Nest.swift
@@ -17,3 +17,5 @@ public protocol ResponseType {
   var body:String? { get }
 }
 
+public typealias Application = RequestType -> ResponseType
+
diff --git a/README.md b/README.md
index 312a6b9..c3ab311 100644
--- a/README.md
+++ b/README.md
@@ -25,8 +25,8 @@ The interface must not make use any external frameworks and only depend on core
 A simple Hello World web application using the Nest interface:
 
 ```swift
-func application(env:[String:AnyObject]) -> (String, [(String, String)], String?) {
-    return ("200 OK", [("Content-Type", "text/plain")], "Hello World")
+func application(request:RequestType) -> ResponseType {
+    return Response(.Ok, body: "Hello World")
 }
 ```
 
@@ -46,7 +46,7 @@ Along with providing a specification, Nest also provides a [test suite](https://
 
 ### Other
 
-- [Inquiline](https://github.com/nestproject/Inquiline) - A collection of constants and typealiases to aid dealing with Nest.
+- [Inquiline](https://github.com/nestproject/Inquiline) - A standard implementation of RequestType and ResponseType.
 - [Padlock](https://github.com/nestproject/Padlock) - Nest middleware to lockup your web application.
 
 ## See Also
diff --git a/Specification.md b/Specification.md
index 4a04f55..9ef15cf 100644
--- a/Specification.md
+++ b/Specification.md
@@ -1,21 +1,25 @@
 ---
-Version: 0.1.0
+Version: 0.2.0
 ---
 
 # Nest Specification
 
-There are two components that make up the Nest interface, the “server” or “gateway” component, and the “application” or “framework” component.
+There are two components that make up the Nest interface, the “server” or
+“gateway” component, and the “application” or “framework” component.
 
 The server component invokes the function that is provided by the application.
 
 ## Application
 
-A Nest application is a simple Swift function that takes exactly one argument, the environment. It returns a tuple (the response) containing exactly three values, the status, headers and the body.
+A Nest application is a simple Swift function that takes exactly one argument,
+an object or structure that conforms to RequestType. It returns an instance
+of a ResponseType which contains exactly three values, the status, headers
+and the body.
 
 The full type of the application function is as follows:
 
 ```swift
-([String:AnyObject]) -> (String, [(String, String)], String?)
+RequestType -> ResponseType
 ```
 
 ## Server
@@ -23,14 +27,30 @@ The full type of the application function is as follows:
 The server or gateway invokes the applications function once for each request
 from a client.
 
-## Details
+```swift
+public typealias Header = (String, String)
+```
 
-### Environment
+## RequestType
 
-- `REQUEST_METHOD` (String) - The HTTP request method, such as “GET” or “POST”.
-- `PATH_INFO` (String) - The HTTP Path.
+```swift
+public protocol RequestType {
+  var method:String { get }
+  var path:String { get }
+  var headers:[Header] { get }
+  var body:String? { get }
+}
+```
 
-### The Response
+### ResponseType
+
+```swift
+public protocol ResponseType {
+  var statusLine:String { get }
+  var headers:[Header] { get }
+  var body:String? { get }
+}
+```
 
 #### Status (`String`)