1. OWL Document Roadmap
TheOWL Overview gives a simple introduction to OWL by providing a language feature listing with very brief feature descriptions;
The OWL Guide demonstrates the use of the OWL language by providing an extended example. It also provides a glossary of the terminology used in these documents;
The OWL Reference gives a systematic and compact (but still informally stated) description of all the modelling primitives of OWL;
The OWL Semantics and Abstract Syntax document is the final and formally stated normative definition of the language;
The OWL Web Ontology Language Test Cases document contains a large set of test cases for the language;
The OWL Use Cases and Requirements document contains a set of use cases for a web ontology language and compiles a set of requirements for OWL.