An element is not a tag: (And why you should care)

Too many people say ''tag'' when they mean ''element''. While this might seem to be just semantic quibbling, the difference is actually important. The power of SGML-based processing lies precisely in the fact that an element is more than a tag. By examining three systems that exploit the paver of SGML to allow sophisticated actions on content, this talk shows that understanding an element as more than just the tags that delimit if is a critical part of exploiting the full power of SGML.