from CWI report
Second generation Web content generates HTML pages on demand, e.g. by filling in templates with content retrieved dynamically from a database or transformation of structured documents using style sheets (e.g. XSLT).
from CWI report
Third generation Web pages will make use of rich markup (e.g. XML) along with metadata (e.g. RDF) schemes to make the content not only machine readable but also machine processable --- a necessary pre-requisite to the Semantic Web.
from CWI report
While text-based content on the Web is already rapidly approaching the third generation, multimedia content is still trying to catch up with second generation techniques.