Building upon the system requirements given in ATIS-0800010, Emergency Alert Service Provisioning Specifications, the IPTV Emergency Alert System Metadata Specification in this document defines an XML schema used for delivery of emergency alert signaling and information to the IPTV service provider¿s EAS Ingestion System (EIS), and for delivery of alert information and signaling to the IPTV Terminal Function on the consumer premesis. In addition, the document specifies the methods used to authenticate EAS data and audio files.