National Digital Forecast Database (NDFD) Simple Object Access Protocol (SOAP) and Representational State Transfer (REST) XML Web Service What is NDFD XML (DWML and TSML)? Why provide an NDFD XML Web Service? How often is NDFD XML data updated? How is NDFD XML data generated? What does NDFD XML data contain? How Do You Use the Web Service? NDFD XML Web Service Constraints, Guidelines, and Best Pra