json_schema: {
      "items": {
          "type": "object",
          "properties": {
              "configuration_file": {
                  "x-cap-file": {},
                  "type": "string",
                  "description": "e.g. my_job_config.py",
                  "title": "Configuration File"
              },
              "output_data": {
                  "x-cap-file": {},
                  "type": "string",
                  "description": "e.g. myfile-data.root",
                  "title": "Output"
              },
              "run_instructions": {
                  "x-cap-file": {},
                  "type": "string",
                  "description": "e.g. README.md",
                  "title": "Run Instructions"
              }
          },
          "title": "Add Processing Step"
      },
      "$schema": "http://json-schema.org/draft-04/schema#",
      "required": [
          "configuration_file",
          "run_instructions",
          "output_data"
      ],
      "type": "array",
      "title": "Processing Steps"
  }