The web can be represented by a graph with special regions: SCC, IN, OUT and TENDRILS.
Regions are defined by the link-path-reach from one website to others.
The linkage to and from a website (in- and out-degree) seems to conform the power law, which is also mentioned in this document.
A pre-relational databases datamodel. "Preceeded" by the relational model since the flexibility of this makes it hard to work with. Now re-invented in RDF :)
I. Hubner, E. Deeds, and E. Shakhnovich. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 103 (47):
17747-17752(November 2006)
W. Bielecki, T. Klimek, and K. Trifunovic. Electronic Notes in Discrete Mathematics, (2009)International Conference on Graph Theory and its Applications.