This is the first sentence of which ground-breaking document:
"The importance of a Web page is an inherently subjective matter, which depends on the readers interests, knowledge and attitudes."
In the paragraph above, is "This is... document" correct English? Also, theoretically, shouldn't there be two punctuations after "document", a colon, and a question mark, since it's a question. What do you do in such a case?
Possibly related question: A colon after "following"