RDF and Topic Maps may appear to address this problem (they are after all specifications for expressing “semantic relations,” and they both have XML transfer syntaxes), but in reality their focus is on generic semantics — propositions about the real world — and not the semantics of markup languages.
TEI By Example offers a series of freely available online tutorials walking individuals through the different stages in marking up a document in TEI (Text Encoding Initiative). Besides a general introduction to text encoding, step-by-step tutorial modules provide example-based introductions to eight different aspects of electronic text markup for the humanities. Each tutorial module is accompanied with a dedicated examples section, illustrating actual TEI encoding practise with real-life examples. The theory of the tutorial modules can be tested in interactive tests and exercises.
DocumentCloud is a catalog of primary source documents and a tool for annotating, organizing and publishing them on the web. Documents are contributed by journalists, researchers and archivists. We're helping reporters get more out of documents and helping newsrooms make their online presence more engaging.
T. Nellhaus. 1, page 257-277. (2001)"It is unclear, however, what relationship there might be between TEI headers and RDF. In principle, it should be feasible to create a crosswalk...".
A. Aschenbrenner, M. Kuster, C. Ludwig, and T. Vitt. Digital Ecosystems and Technologies, 2009. DEST '09. 3rd IEEE International Conference on, page 745 -750. (June 2009)
U. Borghoff, P. Rödig, and J. Scheffczyk. Springer-Verlag Berlin Heidelberg, Online-Ausg. edition, (2006)by Uwe M. Borghoff, Peter Rödig, Lothar Schmitz, Jan Scheffczyk.