Page 86 - DCAP512_WAP_AND_WML

WAP & WML

Notes

Notes Users will only ever be one click away from performing a main-path activity. Other
activities will also be reachable in a simple way. This is in sharp contrast with the Nokia 7110.
<do type=”accept”> elements are normally used to support main-path activities. They are also
called ACCEPT buttons. Other activities are supported through <do type=”options”> elements
(OPTION elements).

Figure 6.2: OPTION Element Example

If you have a single main-path activity, for example, the best you can do is to associate it with an
ACCEPT button, which is always bound to a softkey (usually mapped to Softkey1). This way,
your users are only one click away from the activity they are most likely to perform.

If you have a single <do type=”option”> element (or OPTION button), this will be mapped to
Softkey2. In the case of multiple OPTION buttons, Softkey2 will display the label menu, which
leads to a pseudo-card that allows you to select the option from a simple list (similarly to
Softkey1 on the 7110).
Some UP.Browser phones support three softkeys. In that case, you can afford an ACCEPT task
and two OPTION tasks without the need to go through an extra menu.
In the diagram, you can see softkey1 on the left and softkey2 on the right, but this is not always
the case. Softkeys occupy different positions in different implementations of the UP.Browser.

6.4.2 Why HTML is not used in WAP?

HTML was modeled for high bandwidth; it delivers large data files on dedicated connections.
WML is compact for lower bandwidth pipeline; and therefore sends binary encoded content in
small packets.

Compatibility of WAP with others

In the past, wireless Internet access has been restricted by the capabilities of handheld devices
and wireless networks. WAP utilizes standards such as XML, user datagram protocol (UDP), and
Internet Protocol (IP).
Many of the protocols are based on the Internet standards such as hypertext transfer protocol
(HTTP) and TLS but have been optimized for the unique constraints of the wireless environment
like the following:
 Low bandwidth
 High latency
 Less connection stability

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