Resource discovery means the discovery of resources including data and services needed for an application. Syntactic discovery refers to the discovery on the basis of syntactic comparison operations. It is classified as "keyword-based" and "full-text-based" discovery. Semantic discovery on the other hand, refers to the discovery of resources on he basis of some semantic definition. Therefore, semantic discovery requires that a resource be published by a semantic definition as defined in the topic WB3-5.