Description of the illustration wm_rdf_rules

This is a text description of Figure 6-1, "Physical Versioning of Entailment (Rules Index)", which is described before and after the illustration.

The illustration uses boxes to show the following: The RDF model includes some differences from workspace W1 and some differences from workspace W2. For the rules index, there are three private copies maintained: one for the LIVE workspace, one for the W1 workspace, and one for the W2 workspace. Each of the private copies for workspaces W1 and W2 includes the information for the LIVE workspace, plus information about differences from the associated other workspace (W1 or W2).