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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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  ## Domain Specific Language for secondary files

  Fields may be tagged `secondaryFilesDSL: true` in `jsonldPredicate`.  If so, the field is expanded using the
  following micro-DSL for secondary files:

  * If the value is a string, it is transformed to an object with two fields `pattern` and `required`
  * By default, the value of `required` is `null` (this indicates default behavior, which may be based on the context)
  * If the value ends with a question mark `?` the question mark is
    stripped off and the value of the field `required` is set to `False`
  * The remaining value is assigned to the field `pattern`

  ### Secondary files DSL example

  Given the following schema:

  ```
- $include: sfdsl_res_schema.yml
- |
  ```

  Process the following example:

  ```
- $include: sfdsl_res_src.yml
- |
  ```

  This becomes:

  ```
- $include: sfdsl_res_proc.yml
- |
  ```