ASDF Schema Definitions

This reference section describes the schema files for the built-in tags in ASDF.

ASDF schemas are arranged into “modules”. All ASDF implementations must support the “core” module, but the other modules are optional.

The ASDF Standard also defines two meta-schemas that are used for validating the ASDF schemas themselves. These schemas are useful references when creating custom schemas (see Designing a new tag and schema).

The following graph shows the dependencies between modules:

digraph modules { "fits" -> "core" "unit" -> "core" "time" -> "core" "core" -> "unit" }