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topology_template:       
  node_templates:
    my_firewall# the provider service topology captures the guts of what's required to be instantiated in order
    # to be prepared to allot, e.g., the allotted firewall network functions
    some_vnf:
      type: some.concrete.type.which.forms.the.internals.of.the.provider.service


    possibly_some_other_vnf:
      type: vendorXXX.nodes.MyVerySpecialFirewallalso.some.concrete.type.which.forms.the.internals.of.the.provider.service
           
  substitution_mappings:
    type: vendorXXX.nodes.FirewallsProvidingService
    capabilities:
      i_can_provide_firewalls: [my_firewall, i_can_provide_firewalls]
       

node_types:
  onap.examples.nodes.FirewallShare:
    derived_from: onap.examples.nodes.Firewall
    description: an abstract firewall as AR
    requirements:
      - i_need_a_providing_service:
          capability: onap.capabilities.AllottedResourceProvider 


topology_template:
  node_templates:
 
    # A more releasedunconstrained abstraction of a firewall, can be implemented by any way including an allotted resource
    firewall_1:
      type: onap.examples.nodes.Firewall
 
    # A more restricted abstraction - must be resolved by an allotted resource
    firewall_2:
      type: onap.examples.nodes.FirewallShare
    
    # service designer specifies the exact allotted firewall
    firewall_3:
      type: vendorXXX.nodes.MyVerySpecialFirewall