HTML and CSS Reference
Figure 14-4. Subject-predicate-object triples retrieved from a valid RDF file
Optionally, the RDF graph can be generated in various formats, including embedded or linked PNG, SVG, GIF,
PostScript, IsaViz/ZVTM, HPGL, and HPGL/2. Although the arcs look like hand-drawn curves and often overlap each
other—which is not the most visually appealing representation—the image output can be useful for demonstrational
or designing purposes (Figure 14-5 ). Note that there are only very few similar services available on the Web for
generating graph images from RDF.
Figure 14-5. Detail of an RDF graph generated by the W3C RDF Validation Service
■ in contrast to the raster (pnG) output, the SVG output not only has incomparable quality but also contains the
Uris as hyperlinks.