对于那些高度积极的人来说，也可以用大量的元数据来注释您的工具。这个例子包含了EDAM本体标签作为关键字(允许对相关工具进行分组)，暗示了使用该工具的硬件需求，以及更多的元数据字段。
    metadata_example3.cwl

    1. #!/usr/bin/env cwl-runner
    2. cwlVersion: v1.0
    3. class: CommandLineTool
    5. label: An example tool demonstrating metadata.
    6. doc: Note that this is an example and the metadata is not necessarily consistent.
    8. hints:
    9.   ResourceRequirement:
    10.     coresMin: 4
    12. inputs:
    13.   aligned_sequences:
    14.     type: File
    15.     label: Aligned sequences in BAM format
    16.     format: edam:format_2572
    17.     inputBinding:
    18.       position: 1
    20. baseCommand: [ wc, -l ]
    22. stdout: output.txt
    24. outputs:
    25.   report:
    26.     type: stdout
    27.     format: edam:format_1964
    28.     label: A text file that contains a line count
    30. s:author:
    31.   - class: s:Person
    32.     s:identifier: https://orcid.org/0000-0002-6130-1021
    33.     s:email: mailto:dyuen@oicr.on.ca
    34.     s:name: Denis Yuen
    36. s:contributor:
    37.   - class: s:Person
    38.     s:identifier: http://orcid.org/0000-0002-7681-6415
    39.     s:email: mailto:briandoconnor@gmail.com
    40.     s:name: Brian O'Connor
    42. s:citation: https://dx.doi.org/10.6084/m9.figshare.3115156.v2
    43. s:codeRepository: https://github.com/common-workflow-language/common-workflow-language
    44. s:dateCreated: "2016-12-13"
    45. s:license: https://spdx.org/licenses/Apache-2.0 
    47. s:keywords: edam:topic_0091 , edam:topic_0622
    48. s:programmingLanguage: C
    50. $namespaces:
    51.  s: https://schema.org/
    52.  edam: http://edamontology.org/
    54. $schemas:
    55.  - http://schema.org/version/9.0/schemaorg-current-http.rdf
    56.  - http://edamontology.org/EDAM_1.18.owl