YAML
YAML is easier for humans to read and write than other common data formats like XML or JSON.
list "- " (a dash and a space):
dictionary key: value form (the colon must be followed by a space):
http://docs.ansible.com/ansible/latest/reference_appendices/YAMLSyntax.html?highlight=yaml
原文：http://blog.51cto.com/marvinchen/2091915