[BUGFIX] Drawing an NLSML doc should return something structured/parsed

Fixes #22

CHANGELOG.md

@@ -1,6 +1,7 @@
 # [develop](https://github.com/benlangfeld/ruby_speech)
   * Bugfix: String nodes should take non-strings and cast to a string (`#to_s`)
   * Bugfix: Cleanly handle NLSML with no input tag
+  * Bugfix: Drawing an NLSML doc should return something structured/parsed
 
 # [2.3.1](https://github.com/benlangfeld/ruby_speech/compare/v2.3.0...v2.3.1) - [2014-02-24](https://rubygems.org/gems/ruby_speech/versions/2.3.1)
   * Bugfix: Phone number grammar should only allow a single instance of '*'/'x'

lib/ruby_speech/nlsml/builder.rb

@@ -5,11 +5,12 @@ class Builder
 
       def initialize(options = {}, &block)
         options = {'xmlns' => NLSML_NAMESPACE}.merge(options)
-        @document = Nokogiri::XML::Builder.new do |builder|
+        xml_doc = Nokogiri::XML::Builder.new do |builder|
           builder.result options do |r|
             apply_block r, &block
           end
         end.doc
+        @document = RubySpeech::NLSML::Document.new xml_doc
       end
 
       def interpretation(*args, &block)

lib/ruby_speech/nlsml/document.rb

@@ -38,6 +38,10 @@ def noinput?
         noinput_elements.any?
       end
 
+      def to_xml
+        document.to_xml
+      end
+
       private
 
       def nomatch?

spec/ruby_speech/nlsml_spec.rb

@@ -55,6 +55,22 @@
       document.to_xml.should == expected_document
     end
 
+    it "should return a structured/parsed document" do
+      document = RubySpeech::NLSML.draw(grammar: 'http://flight') do
+        interpretation confidence: 0.6 do
+          input "I want to go to Pittsburgh", mode: :speech
+
+          instance do
+            airline do
+              to_city 'Pittsburgh'
+            end
+          end
+        end
+      end
+
+      document.should be_match
+    end
+
     context "with a string instance" do
       let :example_document do
         '''