tosca_definitions_version: tosca_simple_yaml_1_0_0
node_types: 
  tosca.nodes.WebServer:
    derived_from: tosca.nodes.SoftwareComponent
    capabilities:
      # Private, layer 4 endpoints 
      data_endpoint: tosca.capabilities.Endpoint
      admin_endpoint: tosca.capabilities.Endpoint.Admin
      host: 
        type: tosca.capabilities.Container
        valid_source_types: [ tosca.nodes.WebApplication ]