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	diff --git a/README.md b/README.md
	index 0f0d359..6871717 100644
	--- a/README.md
	+++ b/README.md
	@@ -1,253 +1,253 @@
	# Open API Spex [![Build Status](https://travis-ci.org/mbuhot/open_api_spex.svg?branch=master)](https://travis-ci.org/mbuhot/open_api_spex)

	Add Open API Specification 3 (formerly swagger) to Plug applications.

	## Installation

	The package can be installed by adding `open_api_spex` to your list of dependencies in `mix.exs`:

	```elixir
	def deps do
	[
	{:open_api_spex, github: "mbuhot/open_api_spex"}
	]
	end
	```

	## Generating an API spec

	Start by adding an `ApiSpec` module to your application.

	```elixir
	defmodule MyApp.ApiSpec do
	alias OpenApiSpex.{OpenApi, Server, Info, Paths}

	def spec do
	%OpenApi{
	servers: [
	# Populate the Server info from a phoenix endpoint
	Server.from_endpoint(MyAppWeb.Endpoint, otp_app: :my_app)
	],
	info: %Info{
	title: "My App",
	version: "1.0"
	},
	# populate the paths from a phoenix router
	paths: Paths.from_router(MyAppWeb.Router)
	}
	\|> OpenApiSpex.resolve_schema_modules() # discover request/response schemas from path specs
	end
	end
	```

	For each plug (controller) that will handle api requests, add an `open_api_operation` callback.
	It will be passed the plug opts that were declared in the router, this will be the action for a phoenix controller.

	```elixir
	defmodule MyApp.UserController do
	alias OpenApiSpex.Operation
	alias MyApp.Schemas.UserResponse

	@spec open_api_operation(any) :: Operation.t
	def open_api_operation(action), do: apply(__MODULE__, :"#{action}_operation", [])

	@spec show_operation() :: Operation.t
	def show_operation() do

	%Operation{
	tags: ["users"],
	summary: "Show user",
	description: "Show a user by ID",
	operationId: "UserController.show",
	parameters: [
	Operation.parameter(:id, :path, :integer, "User ID", example: 123)
	],
	responses: %{
	200 => Operation.response("User", "application/json", UserResponse)
	}
	}
	end
	def show(conn, %{"id" => id}) do
	{:ok, user} = MyApp.Users.find_by_id(id)
	json(conn, 200, user)
	end
	end
	```

	Declare the JSON schemas for request/response bodies in a `Schemas` module:
	Each module should export a `schema/0` function, and may optionally declare a struct,
	linked to the JSON schema through the `x-struct` extension property.

	```elixir
	defmodule MyApp.Schemas do
	alias OpenApiSpex.Schema

	defmodule User do
	@derive [Poison.Encoder]
	@schema %Schema{
	title: "User",
	description: "A user of the app",
	type: :object,
	properties: %{
	id: %Schema{type: :integer, description: "User ID"},
	name: %Schema{type: :string, description: "User name"},
	email: %Schema{type: :string, description: "Email address", format: :email},
	inserted_at: %Schema{type: :string, description: "Creation timestamp", format: :datetime},
	updated_at: %Schema{type: :string, description: "Update timestamp", format: :datetime}
	},
	required: [:name, :email],
	example: {
	"id" => 123,
	"name" => "Joe",
	"email" => "joe@gmail.com"
	}
	"x-struct": __MODULE__
	}
	def schema, do: @schema
	defstruct Map.keys(@schema.properties)
	end

	defmodule UserResponse do
	- @schema %Schema{
	+ require OpenApiSpex
	+
	+ # OpenApiSpex.schema/1 macro can be optionally used to reduce boilerplate code
	+ OpenApiSpex.schema %{
	title: "UserResponse",
	description: "Response schema for single user",
	type: :object,
	properties: %{
	data: User
	- },
	- "x-struct": __MODULE__
	+ }
	}
	- def schema, do: @schema
	- defstruct Map.keys(@schema.properties)
	end
	end
	```

	Now you can create a mix task to write the swagger file to disk:

	```elixir
	defmodule Mix.Tasks.MyApp.OpenApiSpec do
	def run([output_file]) do
	json =
	MyApp.ApiSpec.spec()
	\|> Poison.encode!(pretty: true)

	:ok = File.write!(output_file, json)
	end
	end
	```

	Generate the file with: `mix myapp.openapispec spec.json`

	## Serving the API Spec from a Controller

	To serve the API spec from your application, first add the `OpenApiSpex.Plug.PutApiSpec` plug somewhere in the pipeline.

	```elixir
	pipeline :api do
	plug OpenApiSpex.Plug.PutApiSpec, module: MyApp.ApiSpec
	end
	```

	Now the spec will be available for use in downstream plugs.
	The `OpenApiSpex.Plug.RenderSpec` plug will render the spec as JSON:

	```elixir
	scope "/api" do
	pipe_through :api
	resources "/users", MyApp.UserController, only: [:create, :index, :show]
	get "/openapi", OpenApiSpex.Plug.RenderSpec, []
	end
	```

	## Use the API Spec to cast params

	Add the `OpenApiSpex.Plug.Cast` plug to a controller to cast the request parameters to elixir types defined by the operation schema.

	```elixir
	plug OpenApiSpex.Plug.Cast, operation_id: "UserController.show"
	```

	The `operation_id` can be inferred when used from a Phoenix controller from the contents of `conn.private`.

	```elixir
	defmodule MyApp.UserController do
	use MyAppWeb, :controller
	alias OpenApiSpex.Operation
	alias MyApp.Schemas.{User, UserRequest, UserResponse}

	plug OpenApiSpex.Plug.Cast

	def open_api_operation(action) do
	apply(__MODULE__, "#{action}_operation", [])
	end

	def create_operation do
	import Operation
	%Operation{
	tags: ["users"],
	summary: "Create user",
	description: "Create a user",
	operationId: "UserController.create",
	parameters: [],
	requestBody: request_body("The user attributes", "application/json", UserRequest),
	responses: %{
	201 => response("User", "application/json", UserResponse)
	}
	}
	end

	def create(conn, %UserRequest{user: %User{name: name, email: email, birthday: birthday = %Date{}}}) do
	# params are cast to UserRequest struct
	end
	end
	```


	## Use the API Spec to validate Requests

	Add both the `Cast` and `Validate` plugs to your controller / plug:

	```elixir
	plug OpenApiSpex.Plug.Cast
	plug OpenApiSpex.Plug.Validate
	```

	Now the client will receive a 422 response whenever the request fails to meet the validation rules from the api spec.

	## Validating Schema Examples

	As schemas evolve, you may want to confirm that the examples given match the schemas.
	Use the `OpenApiSpex.Test.Assertions` module to assert on schema validations.

	```elixir
	Use ExUnit.Case
	import OpenApiSpex.Test.Assertions

	test "UsersResponse example matches schema" do
	api_spec = MyApp.ApiSpec.spec()
	schema = MyApp.Schemas.UsersResponse.schema()
	assert_schema(schema.example, "UsersResponse", api_spec)
	end
	```

	## Validating API responses in Tests

	Api responses can be tested against schemas using `OpenApiSpex.Test.Assertions` also:

	```elixir
	use MyApp.ConnCase
	import OpenApiSpex.Test.Assertions

	test "UserController produces a UsersResponse", %{conn: conn} do
	api_spec = MyApp.ApiSpec.spec()
	json =
	conn
	\|> get(user_path(conn, :index))
	\|> json_response(200)

	assert_schema(json, "UsersResponse", api_spec)
	end
	```

	TODO: SwaggerUI 3.0
	diff --git a/lib/open_api_spex.ex b/lib/open_api_spex.ex
	index 5182451..a28badf 100644
	--- a/lib/open_api_spex.ex
	+++ b/lib/open_api_spex.ex
	@@ -1,36 +1,82 @@
	defmodule OpenApiSpex do
	alias OpenApiSpex.{OpenApi, Operation, Reference, Schema, SchemaResolver}

	@moduledoc """
	"""
	def resolve_schema_modules(spec = %OpenApi{}) do
	SchemaResolver.resolve_schema_modules(spec)
	end

	@doc """
	Cast params to conform to a Schema or Operation spec.
	"""
	def cast(spec = %OpenApi{}, schema = %Schema{}, params) do
	Schema.cast(schema, params, spec.components.schemas)
	end
	def cast(spec = %OpenApi{}, schema = %Reference{}, params) do
	Schema.cast(schema, params, spec.components.schemas)
	end
	def cast(spec = %OpenApi{}, operation = %Operation{}, params, content_type \\ nil) do
	Operation.cast(operation, params, content_type, spec.components.schemas)
	end


	@doc """
	Validate params against a Schema or Operation spec.
	"""
	def validate(spec = %OpenApi{}, schema = %Schema{}, params) do
	Schema.validate(schema, params, spec.components.schemas)
	end
	def validate(spec = %OpenApi{}, schema = %Reference{}, params) do
	Schema.validate(schema, params, spec.components.schemas)
	end
	def validate(spec = %OpenApi{}, operation = %Operation{}, params = %{}, content_type \\ nil) do
	Operation.validate(operation, params, content_type, spec.components.schemas)
	end
	+
	+ @doc """
	+ Declares a OpenApiSpex Schema
	+
	+ - defines the schema/0 callback
	+ - ensures the schema is linked to the module by "x-struct" extension property
	+ - defines a struct with keys matching the schema properties
	+ - defines a @type `t` for the struct
	+ - derives a `Poison.Encoder` for the struct
	+
	+ ## Example
	+
	+ require OpenApiSpex
	+
	+ defmodule User do
	+ OpenApiSpex.schema %{
	+ title: "User",
	+ description: "A user of the app",
	+ type: :object,
	+ properties: %{
	+ id: %Schema{type: :integer, description: "User ID"},
	+ name: %Schema{type: :string, description: "User name", pattern: ~r/[a-zA-Z][a-zA-Z0-9_]+/},
	+ email: %Schema{type: :string, description: "Email address", format: :email},
	+ inserted_at: %Schema{type: :string, description: "Creation timestamp", format: :'date-time'},
	+ updated_at: %Schema{type: :string, description: "Update timestamp", format: :'date-time'}
	+ },
	+ required: [:name, :email],
	+ example: %{
	+ "id" => 123,
	+ "name" => "Joe User",
	+ "email" => "joe@gmail.com",
	+ "inserted_at" => "2017-09-12T12:34:55Z",
	+ "updated_at" => "2017-09-13T10:11:12Z"
	+ }
	+ }
	+ end
	+ """
	+ defmacro schema(body) do
	+ quote do
	+ @schema struct(OpenApiSpex.Schema, Map.put(unquote(body), :"x-struct", __MODULE__))
	+ def schema, do: @schema
	+ @derive [Poison.Encoder]
	+ defstruct Map.keys(@schema.properties)
	+ @type t :: %__MODULE__{}
	+ end
	+ end
	end
	diff --git a/test/support/schemas.ex b/test/support/schemas.ex
	index 3e12255..6c3b6ac 100644
	--- a/test/support/schemas.ex
	+++ b/test/support/schemas.ex
	@@ -1,124 +1,90 @@
	defmodule OpenApiSpexTest.Schemas do
	+ require OpenApiSpex
	alias OpenApiSpex.Schema

	defmodule User do
	- @derive [Poison.Encoder]
	- @schema %Schema{
	+ OpenApiSpex.schema %{
	title: "User",
	description: "A user of the app",
	type: :object,
	properties: %{
	id: %Schema{type: :integer, description: "User ID"},
	name: %Schema{type: :string, description: "User name", pattern: ~r/[a-zA-Z][a-zA-Z0-9_]+/},
	email: %Schema{type: :string, description: "Email address", format: :email},
	inserted_at: %Schema{type: :string, description: "Creation timestamp", format: :'date-time'},
	updated_at: %Schema{type: :string, description: "Update timestamp", format: :'date-time'}
	},
	required: [:name, :email],
	example: %{
	"id" => 123,
	"name" => "Joe User",
	"email" => "joe@gmail.com",
	"inserted_at" => "2017-09-12T12:34:55Z",
	"updated_at" => "2017-09-13T10:11:12Z"
	- },
	- "x-struct": __MODULE__
	- }
	- def schema, do: @schema
	- defstruct Map.keys(@schema.properties)
	-
	- @type t :: %__MODULE__{
	- id: integer,
	- name: String.t,
	- email: String.t,
	- inserted_at: DateTime.t,
	- updated_at: DateTime.t
	+ }
	}
	end

	defmodule UserRequest do
	- @derive [Poison.Encoder]
	- @schema %Schema{
	+ OpenApiSpex.schema %{
	title: "UserRequest",
	description: "POST body for creating a user",
	type: :object,
	properties: %{
	user: User
	},
	example: %{
	"user" => %{
	"name" => "Joe User",
	"email" => "joe@gmail.com"
	}
	- },
	- "x-struct": __MODULE__
	- }
	- def schema, do: @schema
	- defstruct Map.keys(@schema.properties)
	-
	- @type t :: %__MODULE__{
	- user: User.t
	+ }
	}
	end

	defmodule UserResponse do
	- @derive [Poison.Encoder]
	- @schema %Schema{
	+ OpenApiSpex.schema %{
	title: "UserResponse",
	description: "Response schema for single user",
	type: :object,
	properties: %{
	data: User
	},
	example: %{
	"data" => %{
	"id" => 123,
	"name" => "Joe User",
	"email" => "joe@gmail.com",
	"inserted_at" => "2017-09-12T12:34:55Z",
	"updated_at" => "2017-09-13T10:11:12Z"
	}
	},
	"x-struct": __MODULE__
	}
	- def schema, do: @schema
	- defstruct Map.keys(@schema.properties)
	-
	- @type t :: %__MODULE__{
	- data: User.t
	- }
	end

	defmodule UsersResponse do
	- @derive [Poison.Encoder]
	- @schema %Schema{
	+ OpenApiSpex.schema %{
	title: "UsersResponse",
	description: "Response schema for multiple users",
	type: :object,
	properties: %{
	data: %Schema{description: "The users details", type: :array, items: User}
	},
	example: %{
	"data" => [
	%{
	"id" => 123,
	"name" => "Joe User",
	"email" => "joe@gmail.com"
	},
	%{
	"id" => 456,
	"name" => "Jay Consumer",
	"email" => "jay@yahoo.com"
	}
	]
	- },
	- "x-struct": __MODULE__
	- }
	- def schema, do: @schema
	- defstruct Map.keys(@schema.properties)
	-
	- @type t :: %__MODULE__{
	- data: [User.t]
	+ }
	}
	end
	end
	\ No newline at end of file

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