Sony Ericsson P910i - Manual (Page 196)

196 Terms and definitions
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WTLS
Wireless Transport Layer Security. Part of WAP, WTLS
provides privacy, data integrity and authentication on transport
layer level between two applications.
W3C
The main standards body for the WWW.
xHTML
Extensible Hypertext Markup Language. A reformulation of
HTML 4.01 in XML. Being XML, means that XHTML can be
viewed, edited, and validated with standard XML tools. At the
same time, it operates as well as or better than HTML 4 in
existing HTML 4 conforming user agents.
XML
Extensible Markup Language. An initiative from the W3C
defining an ‘extremely simple’ dialect of SGML suitable for use
on the WWW.