module demo-topology {
	yang-version 1;
    namespace "";
    prefix "tp";

    organization "Cisco";

    contact "WILL-BE-DEFINED-LATER";

    description "
		This module contains the definitions of elements that creates network 
		topology i.e. definition of network nodes and links. This module is
		not designed to be used solely for network representation. This module
		SHOULD be used as base module in defining the network topology.
	";

    revision "2013-02-08"{
		reference " WILL BE DEFINED LATER";
	}

	container topology {
        description "
			This is the model of abstract topology which contains only Network
			Nodes and Network Links. Each topology MUST be identified by
			unique topology-id for reason that the store could contain many
			topologies.
		";

        leaf topology-id {
            type string;
            description "
				It is presumed that datastore will contain many topologies. To
				distinguish between topologies it is vital to have UNIQUE
				topology identifier.
			";
        }

        container network-nodes {
        	list network-node {
	            description "The list of network nodes defined for topology.";

	        	key "node-id";

	        	leaf node-id {
	        		type string;
	        		description "The Topology identifier of network-node.";
	        	}
                
                list network-interface {
                    key "interface-id";
                    
                    leaf interface-id {
                        type uint8;
                    }
                    
                    leaf interface-address {
                        type string;
                    }
                }
                
	            container node-attributes {
					description "
						Additional attributes that can Network Node contains.
					";

					leaf geo-latitude {
						type decimal64 {
							fraction-digits 2;
						}
						config true;
					}

					leaf geo-longitude {
						type decimal64 {
							fraction-digits 2;
						}
						config true;
					}
				}
        	}
        }
        
        container network-links {
        	list network-link {
	            description "
					The Network Link which is defined by Local (Source) and
					Remote (Destination) Network Nodes. Every link MUST be
					defined either by identifier and his local and remote
					Network Nodes (in real applications it is common that many
					links are originated from one node and end up in same
					remote node). To ensure that we would always know to
					distinguish between links, every link SHOULD have
					identifier.
				";
	        	key "link-id";

	        	leaf link-id {
	        		type string;
	        		description "";
	        	}

	            container source {
					leaf node-id {
						type string;
						description "Source node identifier.";
					}
				}

				container destination {
					leaf node-id {
						type string;
						description "Destination node identifier.";
					}
				}

				container link-attributes {
					description "Aditional attributes that can Network Link contains.";
				}
		    }
        }
    }
}