/**

 * \addtogroup topology Topology Input Readers

 *

 * The topology modules aim at reading a topology file generated by an automatic topology generator.

 *

 * The process is divided in two steps:

 * - running a topology generator to build a topology file

 * - reading the topology file and build a ns-3 simulation

 *

 * Hence, model is focused on being able to read correctly the various topology formats.

 *

 * Currently there are two models:

 * - Orbis 0.7

 * - Inet 3.0

 *

 * A good source for topology data is also Archipelago (http://www.caida.org/projects/ark/)

 *

 * The current Archipelago Measurements, monthly updated, are stored here:

 * http://data.caida.org/datasets/topology/ipv4.allpref24-aslinks/

 * (complete notation and triple data source, one for each working group)

 *

 * A different and more compact notation that signs only the AS-relationships is here:

 * http://www.caida.org/data/active/as-relationships/index.xml

 * (a sort of more Orbis-like format)

 *

 * The compact notation can be easily stripped down to a pure Orbis format, just removing

 * the double relationships (the compact format use one-way links, while Orbis use two-way

 * links) and pruning the 3rd parameter. Note that with the compact data Orbis can then be

 * used create a rescaled version of the topology, thus being the most effective way

 * (to my best knowledge) to make an internet-like topology.

 *

 */