fix issue #5 - fix definition for Checksum type

      Representation: string of variable length.

    type: string

  Checksum: #no definition found

  Checksum:

    description: >

      Cheksum description

      This type represents the checksum of a package or an artifact file.

      The IANA registry [i.7] provides the list of available hash function textual names. The

      provisions about which algorithms to use are expected to be defined by the specifications

      referring to the present data type

    type: object

    required:

      - algorithm

      - hash

    properties:

      algorithm:

        description: >

          Name of the algorithm used to generate the checksum. The name matching when processing the

          attribute value shall be caseinsensitive, for example, "SHA-256" or "sha-256", "SHA-512" or

          "sha-512". See note.

        type: string

      hash:

        description: >

          The hexadecimal value of the checksum.

        type: string

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# TO CHECK IF INCLUDE THESE DATA TYPES IN ANOTHER DEF FILES

  VnfLinkPortData:

    description: >