(from my close friend sarah) an article discussing the significance of Metadata, Semantics, Taxonomy, and Ontology in the years ahead, Semantic Applications: "For example, there are basically five main types of streetlights—red, flashing red, yellow, flashing yellow and green. These colors could be said to define a simple traffic light taxonomy or classification system. However, each light is also associated with a set of rules—go, stop, slow down. This combination of a taxonomy and its predefined properties results in a simple traffic system ontology."