tosca.nodes.SoftwareComponent:
  derived_from: tosca.nodes.Root
  properties:
    # domain-specific software component version
    component_version: 
      type: version
      required: false
    admin_credential: 
      type: tosca.datatypes.Credential
      required: false
  requirements:
    - host: 
        capability: tosca.capabilities.Container
        node: tosca.nodes.Compute
        relationship: tosca.relationships.HostedOn