How to define new Input/Output types

Defining new Input/Output is a smooth process:

• Define a *.yaml file that will contain the new Input/Output data schema/format, i.e.geojson.yaml;
• New objects format has to be defined inside an array element;
• Each new type has few fields that have to be fulfilled:
  • name is the new element name to uniquely identify it inside the new schema;
  • type is a self-explanatory field, for the native supported type please refer to the official documentation;
  • fields here is where new fields are itemized;

- name: Point
  type: record
  fields:

• Users can now define their own types (please have a deep look at the array definition):

- name: Item
  type: record
  doc: "This object represents the metadata for an item in a SpatioTemporal Asset Catalog"
  fields:
    - name: stac_version
      type: string
      doc: "STAC version"
    - stac_extensions
      type:
      - type: array
        items: string
      doc: "STAC extensions"
    - name: collection
      type:
      - type: array
        items: string
      doc: "The ID of the STAC Collection this Item references to."
    - name: links
      type:
      - type: array
        items: Link
      doc: "Links"
    - name: assets
      type:
      - type: array
        items: Asset

where fields can be defined as complex types:

- name: BasicDescriptiveFields
  ...

- name: DateTime
  ...

- name: Instrument
  ...

- name: Licensing
  ...

- name: Provider
  ...

- name: Link
  ...

- name: Asset
  ...

• Users can now use the new defined type as a validated input, importing first the schema in the CWL description;
• Then define an input of type https://raw.githubusercontent.com/eoap/schemas/main/geojson.yaml#Feature:

cwlVersion: v1.2
class: CommandLineTool
requirements:
  ...
  SchemaDefRequirement:
    types:
    - $import: https://raw.githubusercontent.com/eoap/schemas/main/geojson.yaml

inputs:
  feature:
    type: https://raw.githubusercontent.com/eoap/schemas/main/geojson.yaml#Feature
    label: " Feature Input"
    doc: "Input is a Feature."