10/29/2015 Final Version for EIDD workging group eview
03/02/2016 Final Version for publication and public review
09/19/2016 Final Version release incorporating
           - addition of CallerInfo and LocationInfo external XML schemas
           - addition of CallerInfo and LocationInfo to sequence of
             EmergencyCallDataAdapterType
           - Update of ProviderInfo, SubscriberInfo, and vCard external
             XML schemas to reflect RFC 7852 dated July 2016
           - Update of EIDD main document
01/06/2017 Final Version release incorporating comments from NIEM conformance
             review
           - addition of "version" attribute to xsd:schema
           - change of eidd namespace "eidd.nena.org" to a valid URI
             "http://eidd.nena.org"
           - addition of xsd:Documentation to element references used
             in adapter type definitions
           
