Forum Moderators: not2easy
a little bit like how you would choose your meta keywords (if you still use them for those engines that at a pinch might refer to them)
ummmmm...if thats what you were asking ;)
It's a bit of a different creature than variations of a word, such as synonyms or plurals.
As I understand the direction of the semantic web one of the fundamental ideas is to develop a common markup so that documents and their content can be more readily accessible, understandable, organized, etc. by machines: processors and applications.
I think you're mixing apples and oranges. There's keywords in content that hopefully facilitate proper indexing and then there's markup: "This is a paragraph", "This is a summary . . ." One is the human, readable content - that may help a bot or an indexing system to sort, file, assign, etc. The other - the markup - helps software understand what "it" is that the software is accessing: "This is a personal memo", "This is a note", "This is an introductory paragraph", "This is a 3 axis chart".
I'd stick to calling keyword rich content keyword rich content. I'd leave the "semantic" part to the markup that underlies the visible keyword rich content.
In fact, I'd forget the whole business of "keyword rich content" and just write in a focused manner that humans would enjoy reading, that flows naturally, that isn't redundant beyond that which is basic "good writing". Write for humans with a basic understanding of how a stupid web bot can get confused if your article/page/file wanders around a topic.