TAILIEUCHUNG - Webmaster's Guide to the Wireless Internet part 13

Webmaster's Guide to the Wireless Internet part 13. 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 | 92 Chapter 3 A New Markup WML Cache-Control no-cache must-revalidate Pragma no-cache Note In addition to checking how the individual device handles caching be aware that WAP gateways may employ caching technology as well which can be harder to identify. Bookmarking Bookmarking works much in the same way as Web browsing allowing a user to mark a page of interest so that they can return directly to the page at a later date. Sometimes you may not want a user to bookmark your page such as when the URL also contains information specific to that particular session .You can control bookmarking on the Openwave platform with the following meta information meta name forua true content false Understanding the Deck of Cards Paradigm A WML file uses a deck of cards paradigm to structure of each file as a deck within which are any number of cards. Each card is a single page that can be displayed on the device. A simple WML file containing two cards within the deck would look like the following xml version DOCTYPE wml PUBLIC WAPFORUM EN http DTD -- Start of the deck -- wml -- Card 1 -- card card -- Card 2 - - A New Markup WML Chapter 3 93 card card -- End of the deck -- wml Decks are extremely handy for sending the user groups of pages that they are likely to access meaning that the user has to make only one connection to download several separate cards. WML Elements The previous example introduced the concepts of decks and may have noticed that the structure of the deck looked a lot like HTML. In fact WML is quite similar to HTML in its use of elements and attributes to describe the content within each wml and card elements in the example are just two examples of the elements you ll find in the WML language. Adding Attributes Most WML elements have at least one .

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