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.

• Core
  • core/asdf-1.1.0
  • core/complex-1.0.0
  • core/ndarray-1.0.0
  • core/table-1.0.0
  • core/column-1.0.0
  • core/constant-1.0.0
  • core/software-1.0.0
  • core/history_entry-1.0.0
  • core/extension_metadata-1.0.0
  • core/integer-1.0.0
  • core/externalarray-1.0.0
  • core/subclass_metadata-1.0.0
• FITS
  • fits/fits-1.0.0
• Unit
  • unit/unit-1.0.0
  • unit/defunit-1.0.0
  • unit/quantity-1.1.0
• Time
  • time/time-1.1.0

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).

• YAML Schema

• asdf-schema-1.0.0

The following graph shows the dependencies between modules:

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