Digital Weather Markup Language

Overview
The Digital Weather Markup Language (DWML). is an XML language being developed to initially support the exchange of the National Weather Service's (NWS) National Digital Forecast Database (NDFD) data. However, the specification is being written with enough flexibility to accommodate other environmental science applications.

Source

 * "Digial Weather Markup Language Specification" (Ver. 1.0) (full-text).