I'm afraid that's not correct. You can use arbitrary number of spaces to indent a block in YAML[1]. It does't matter if it's 2 of 4 or 17. The only limitations

I'm afraid that's not correct. You can use arbitrary number of spaces to indent a block in YAML[1]. It does't matter if it's 2 of 4 or 17. The only limitations are that it must be greater than the indentation of the parent node (obviously), that all siblings must have the same indentation and that tabs are not allowed. Are you sure you're not mistaking this with HAML? It's a bit stricter with the indentation requirements. [1]: http://www.yaml.org/spec/1.2/spec.html#id2777534 http://www.yaml.org/spec/1.2/spec.html#id2777534