tosca_definitions_version: tosca_simple_yaml_1_0_0
node_types: 
  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