%YAML 1.1
---
$schema: "http://stsci.edu/schemas/yaml-schema/draft-01"
id: "http://astropy.org/schemas/astropy/fits/fits-1.0.0"
title: >
  A FITS file inside of an ASDF file.
description: |
  This schema is useful for distributing ASDF files that can
  automatically be converted to FITS files by specifying the exact
  content of the resulting FITS file.

  Not all kinds of data in FITS are directly representable in ASDF.
  For example, applying an offset and scale to the data using the
  `BZERO` and `BSCALE` keywords.  In these cases, it will not be
  possible to store the data in the native format from FITS and also
  be accessible in its proper form in the ASDF file.

  Only image and binary table extensions are supported.

examples:
  -
    - A simple FITS file with a primary header and two extensions
    - asdf-standard-1.5.0
    - |
        !<tag:astropy.org:astropy/fits/fits-1.0.0>
            - header:
              - [SIMPLE, true, conforms to FITS standard]
              - [BITPIX, 8, array data type]
              - [NAXIS, 0, number of array dimensions]
              - [EXTEND, true]
              - []
              - ['', Top Level MIRI Metadata]
              - []
              - [DATE, '2013-08-30T10:49:55.070373', The date this file was created (UTC)]
              - [FILENAME, MiriDarkReferenceModel_test.fits, The name of the file]
              - [TELESCOP, JWST, The telescope used to acquire the data]
              - []
              - ['', Information about the observation]
              - []
              - [DATE-OBS, '2013-08-30T10:49:55.000000', The date the observation was made (UTC)]
            - data: !core/ndarray-1.0.0
                datatype: float32
                shape: [2, 3, 3, 4]
                source: 0
                byteorder: big
              header:
              - [XTENSION, IMAGE, Image extension]
              - [BITPIX, -32, array data type]
              - [NAXIS, 4, number of array dimensions]
              - [NAXIS1, 4]
              - [NAXIS2, 3]
              - [NAXIS3, 3]
              - [NAXIS4, 2]
              - [PCOUNT, 0, number of parameters]
              - [GCOUNT, 1, number of groups]
              - [EXTNAME, SCI, extension name]
              - [BUNIT, DN, Units of the data array]
            - data: !core/ndarray-1.0.0
                datatype: float32
                shape: [2, 3, 3, 4]
                source: 1
                byteorder: big
              header:
              - [XTENSION, IMAGE, Image extension]
              - [BITPIX, -32, array data type]
              - [NAXIS, 4, number of array dimensions]
              - [NAXIS1, 4]
              - [NAXIS2, 3]
              - [NAXIS3, 3]
              - [NAXIS4, 2]
              - [PCOUNT, 0, number of parameters]
              - [GCOUNT, 1, number of groups]
              - [EXTNAME, ERR, extension name]
              - [BUNIT, DN, Units of the error array]

allOf:
  - tag: "tag:astropy.org:astropy/fits/fits-1.0.0"
  - type: array
    items:
      type: object
      properties:
        # TODO: Why are there no validations for the header here?  The
        # next version of the schema should add them.
        data:
          description: "The data part of the HDU."
          anyOf:
            - $ref: "http://stsci.edu/schemas/asdf/core/ndarray-1.0.0"
            - $ref: "../table/table-1.0.0"
            # Retain backwards compatibility with table defined by ASDF Standard
            - $ref: "http://stsci.edu/schemas/asdf/core/table-1.0.0"
            - type: "null"
          default: null