A very terse HTML summarizer could be specified with a table that only puts emphasized words into the keywords attribute:
HTML ELEMENT SOIF ATTRIBUTES ------------ ----------------------- <A> keywords <B> keywords <EM> keywords <H1> keywords <H2> keywords <H3> keywords <I> keywords <META:CONTENT> $NAME <STRONG> keywords <TITLE> title,keywords <TT> keywords
Conversely, a full-text summarizer can be easily specified with only:
HTML ELEMENT SOIF ATTRIBUTES ------------ ----------------------- <HTML> full-text <TITLE> title,parent