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Webmaster's Guide to the Wireless Internet part 16

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Webmaster's Guide to the Wireless Internet part 16. The Webmaster’s Guide to the Wireless Internet provides the Wireless Webmaster with all of the tools necessary to build the next generation Internet. Packed with the essential information they need to design, develop, and secure robust, e-commerce enabled wireless Web sites. This book is written for advanced Webmasters who are experienced with conventional Web site design and are now faced with the challenge of creating sites that fit on the display of a Web enabled phone or PDA | 122 Table 3.33 The Various Microbrowsers and Their Capabilities Browser Browser Version HDML 3.0 Support WML 1.1 Support WML1.1 with Openwave Extensions WMLScript 1.1 Support Openwave Mobile Browser 4.x Yes via Mobile Access Gateway translation service Yes Yes Recommended Yes Recommended Openwave Mobile Browser 3.1 Yes Recommended Yes via Mobile Access Gateway translation service No No Openwave Mobile Browser 3.0 Yes Recommended No No No Other Any No Yes Recommended No Yes Recommended formerly URBrowser formerly URLink Source Openwave A New Markup WML Chapter 3 123 parent 1 element 1 element 1 parent 2 parent 2 element 2 element 2 parent 2 The Openwave extensions take this concept a stage further. By dividing the tasks you wish to carry out into a hierarchical series and applying context to the specific children it becomes much easier to handle such things as the user interface the use of variables and the exchanging of information between contexts. Navigation within the current context is possible in WML using the go and prev elements. However using the Openwave extensions we can carry on further to provide contextual navigation. Because the Openwave extensions are not covered by the current WML specification remember to reference their DTD instead at the beginning of the WML document as follows xml version 1.0 DOCTYPE wml PUBLIC - PHONE.COM DTD WML 1.1 EN http www.phone.com dtd wml11.dtd Using the spawn and catch Extensions The spawn element allows navigation from a parent to a child in a similar way to a go task. However using the spawn element spawns a new nested context. When this context is exited the user is returned to the parent context. This may seem somewhat trivial but the use of spawn allows users to browse a number of possible cards within this context while returning to the parent context in one move as opposed to go prev where all viewed cards would have to be navigated through to reach the parent card .This can be a powerful way to manage how the .