anchor.diff:  
   ==== Immutability in Ruby
   
  -* https://deveo.com/blog/2013/03/22/immutability-in-ruby-part-1/[Immutability in Ruby - part 1 of 2]
  -* https://deveo.com/blog/2013/03/28/immutability-in-ruby-part-2/[Entities and value objects in Ruby - part 2 of 2]
  +* link:https://deveo.com/blog/2013/03/22/immutability-in-ruby-part-1/[Immutability in Ruby - part 1 of 2]
  +* link:https://deveo.com/blog/2013/03/28/immutability-in-ruby-part-2/[Entities and value objects in Ruby - part 2 of 2]
   
   * http://voormedia.com/blog/2013/02/creating-immutable-tree-data-structures-in-ruby[Creating immutable tree data structures in Ruby - Feb 2013]
   * http://www.confreaks.com/videos/2337-mwrc2013-immutable-ruby[Immutable Ruby presentation video (25 mins) - Michael Fairley @ MountainWest RubyConf 2013]
  
positive.code: 
  === MongoDB
  
  link:http://speakerdeck.com/u/mongodb/p/domain-driven-design-with-mongodb-chris-hafey-on-point-medical-diagnostics[Presentation on Domain Driven Design with MongoDB]
  link:http://wiki.basho.com/Riak-Compared-to-MongoDB.html[Riak Compared to MongoDB]
  
  === Repository Pattern in Ruby
  
  
negative.code: 
  See milestones and issues in GitHub repository for high-level.
  
  == Design Decisions
  
  Information on design choices made, and the relative tradeoffs. Plus resources for further reading.
  