Page 175 - DCAP512_WAP_AND_WML

Unit 12: Secure Application

This offers several benefits to the application developer community, including a familiar Notes
programming model, a proven architecture and the ability to leverage existing tools.
Optimization and extensions have been made in order to match the characteristics of the wireless
environment. Wherever possible, existing standards have been adopted or have been used as
the entry point for the WAP technology.

WAP content and applications are specified in a set of well-known content formats based on the
familiar WWW content formats. Content is transported using a set of standard communications
protocols based on the WWW communications protocols.

Did u know? What is the use of Micro Browser?
A micro browser in the wireless terminal co-ordinates the user interfaces and is analogous
to a standard web browser.
WAP defines a set of standard components that enable communication between mobile terminals
and network servers. These include the following:
 Standard Naming Model: WWW standard URLs are used to identify WAP content on
origin servers. WWW standard URLs are used to identify local resources in a device, e.g.,
call control functions.

 Content Typing: All WAP content is given a specific type consistent with WWW typing.
This allows WAP user agents to correctly process the content based on its type.

 Standard Content Formats: WAP content formats are based on WWW technology and
include display markup, calendar information, electronic business card objects, images
and scripting language.

 Standard Communication Protocols: WAP communication protocols enable the
communication of browser requests from the mobile terminal to the network web server.
The WAP content types and protocols have been optimized for mass market, hand-held wireless
devices. WAP utilizes proxy technology between the wireless domain and the WWW. The WAP
proxy typically is comprised of the following functionality:

 Protocol Gateway: The protocol gateway translates requests from the WAP protocol
stack (WSP, WTP, WTLS, and WDP) to the WWW protocol stack (HTTP and TCP/IP).

 Content Encoders and Decoders: The content encoders translate WAP content into compact
encoded formats to limit the size of data over the network.
This infrastructure ensures that mobile terminal users can browse a wide range of WAP content
and applications and that the application author is able to build content services and applications
that run on a large base of mobile terminals. The WAP proxy permits content and applications
to be hosted on standard WWW servers that include the WAP proxy functionality.

Notes Such a server can be utilized to ease end-to-end security solutions, or applications
that need better access control or a guarantee of responsiveness.

12.2.1 Sample Configurations of WAP Technology

WAP technology is expected to be beneficial for applications and services beyond those specified
by the WAP forum.

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