Glossary
APP-11
Allied Procedural Publication 11 (APP-11) is the NATO Message Catalogue: the publication that defines the formatted messages allied forces exchange and the fields each one carries.
Context
The NATO Standardization Office publishes APP-11, and its current edition is the authority. The catalogue is written in Message Text Format (MTF). The same messages are available as MTF-XML. Each message is built under the construction rules of ADatP-3.
How Gridnorth handles it
The schemas in our laboratory evaluation are stand-ins built on public formats. They are not APP-11 definitions. Testing against APP-11 schemas is the next step, and the standards page will report it.
Last reviewed September 29, 2026