Is XHTML the only future-proof way of presenting multi-page document? Can PDF be used?
As the W3C’s XHTML webpage says (see http://www.w3.org/TR/2001/WD-xhtml1-20011004/) “This specification defines the Second Edition of XHTML 1.0, a reformulation of HTML 4 as an XML 1.0 application, and three DTDs corresponding to the ones defined by HTML 4”. If you’re familiar with HTML 4.0, then the benefit that XHTML brings is to apply the rigor of XML to a markup language with which many people and applications are already familiar. Whilst there is no guarantee that anything is future-proof, the huge amount of information already available in (X)HTML, and the likelihood that future generations of web browsers will be able to read (X)HTML data, makes it highly likely that (X)HTML data will remain usable for many years to come — and the added rigor of XHTML improves the situation greatly. However, XHTML (like HTML) has no notion of “page”, and it is left to the document author to decide how information should be broken down into usable chunks. For example, I could convert the text of
