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YAML has inheritance. The most clear example I have ever seen is here: http://blog.101ideas.cz/posts/dry-your-yaml-files.html I need something more complex: I need to override object's object's property. Here is an example: database: &default server: ip: 192.168.1.5 port: 2000 db_name: test user: name: root password: root # database foo differs from default by only its port and user password foo_database: <<: *default server: port: 2001 db_name: foo user: password: foo_root I want to get this result: foo_database.server.ip -> 192.168.1.5 foo_database.server.port -> 2001 foo_database.db_name -> foo foo_database.user.name -> root foo_database.user.password -> foo_root But if you declare like this, you will get these properties incorrect (according to expected values): foo_database.server.ip -> will be None foo_database.user.name -> will be None because new "server" object has only "port" property and it overrides whole old "server" object. How do I get the kind of inheritance which I want to achieve? Edit Here is my exact intention with a working code in LiveScript : config = default: ip: \192.168.1.5 port: 2000 name: \root password: \root db: name: \default location: \LA foo-database:~ -> @default `merge` do ip: \11.11.11.11 db: name: \my-foo bar-database:~ -> @foo-database `merge` do password: \1234 db: location: \SF config.default # => {"ip":"192.168.1.5","port":2000,"name":"r

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