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Wow, look what showed up today. Kwalify.

If you have a YAML document that looks like this:

 name:   foo
 email:  foo@mail.com
 age:    20
 birth:  1985-01-01

Add a Kwalify schema file:

 type: map
 mapping:
   name: {type: string, required: yes}
   email: {type: string, pattern: /@/}
   age: {type: integer}
   birth: {type: date}

To validate:

 kwalify -f schema.yaml example.yaml

KWOOL!! In hasty eagerness, I whipped up a schema for an example feed. Well done, Makoto Kuwata! To boot, the validator is perfectly scriptable. (Seen on del.icio.us/tag/yaml.)