Objectives of knowledge management

(iv) Enabling rating of content and online services – for example social commerce on 
e-retail sites.
(v) Ad funding of neutral sites – web services such as Google GMail
™
and many blogs are 
based on contextual advertising such as Google AdSense
™
.
(vi) Data exchange between sites through XML- based data standards. RSS is based on XML, 
but has relatively little semantic mark-up to describe the content. Data can also be 
exchanged through standard 
microformats
such as hCalendar and hReview which are 
used to incorporate data from other sites into the Google listings (see 
www.microfor‑
mats.org
for details). New classes of content can also be defined and