Discovery Service: http://code.google.com/apis/discovery/ http://code.google.com/apis/discovery/v1/reference.html The "type" key: http://tools.ietf.org/html/draft-zyp-json-schema-03#section-5.1 The "format" key: http://tools.ietf.org/html/draft-zyp-json-schema-03#section-5.23 http://code.google.com/apis/discovery/v1/reference.html#parameter-format-summary Google JSON format docs: http://google-styleguide.googlecode.com/svn/trunk/jsoncstyleguide.xml