We mentioned recently our plans to include in this weblog posts-by-citation and posts-by-abbreviation features using meaning-rich markup culled from within our weblog entries. The W3C's Semantic Data Extractor has us thinking more about what we can do with simple X/HTML enhancements. The best part? Creating a service like the W3C's is easy, (they're using a single XSLT stylesheet) since the markup's already in place doing most of the work.