The Semantic Web envisioned by Tim Berners Lee garnered much excitement from the research community due to its huge potential in enabling machine-readable web contents. Studies have shown that using semantic web technologies, such as the Resources Description Framework (RDF), not only effectively add meaning to content but also increase the relevancy of search results. This paper investigates the efficient use of the Semantic Web initiatives for Corporate Portal: the focus being the simplification of the content annotation process. It proposes a framework for automatically annotating web document in a controlled environment like a Knowledge Management portal. This is done through the exploitation of presentation structures embedded within documents. The approach introduced is fairly simple yet highly effective in annotating documents automatically. The result of this study presents a promising alternative to existing annotation techniques.