The most frequently quoted defining feature of the Semantic Web is machine usable Web content. Fundamentally, this requires that machines must “know” how to recognize the content they are looking for, and they must “know” what to do when they encounter it. This “knowledge” requires access to the meaning (i.e., semantics) of the content, one way or the other. But what does that mean? The manner in which the machine can access the semantics of Web content is at the heart of the confusion about the Semantic Web.