Need one for syntax highlighting.

Not sure how to implament this but something to look out for in the future.

This is possible with the prefix of a tab, indicating that its in the last key given, for example:

my_key
    other_key other_value
    final_key final_value

Would be valid but

my_key my_value
    key_ wouldnt val_work

Wouldn't to work better with HashMap and interop with json and others.