Real world semantics are concerned with the “mapping of objects in the model or computational world onto the real world ... [and] issues that involve human interpretation, or meaning and use of data or information.” [...] The real world semantics correspond to the concepts in the real world that the items or sets of items refer to. [...] We believe that the idea of real world semantics, as described above captures the essence of the main use of the term “semantics” in a Semantic Web context. However, it is only loosely defined. The ideas of axiomatic and model-theoretic semantics are being used to make the idea of real world semantics for the Semantic Web more concrete.