18f18c07417d35d612b181fd317b31718cecf31f

missing_msg lets the developer specify a custom message in place of the default "Required" if the node is missing.
Colander ======== An extensible package which can be used to: - deserialize and validate a data structure composed of strings, mappings, and lists. - serialize an arbitrary data structure to a data structure composed of strings, mappings, and lists. It runs on Python 2.6, 2.7, 3.2, and 3.3. Please see http://docs.pylonsproject.org/projects/colander/en/latest/ for further documentation. See https://github.com/Pylons/colander for in-development version.
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