ASDF Standard Resources

The included schema and manifest resources made available by the ASDF-standard are described below.

ASDF Standard Schema Definitions

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" }

ASDF Standard Manifests

The ASDF tags (described by schemas) available under each ASDF standard version are all described by a single manifest document for that ASDF standard version.