Page 62 - DCAP512_WAP_AND_WML

WAP & WML

Notes 5.3 Building Decks of Cards

WML pages are often called “decks”. A deck contains a set of cards. A card element can contain
text, markup, links, input-fields, tasks, images and more. Cards can be related to each other with
links.
When a WML page is accessed from a mobile phone, all the cards in the page are downloaded
from the WAP server. Navigation between the cards is done by the phone computer - inside the
phone - without any extra access trips to the server:

<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"http://www.wapforum.org/DTD/wml_1.1.xml">
<wml>
<card id="no1" title="Card 1">

<p>Hello World!</p>
</card>
<card id="no2" title="Card 2">

<p>Welcome to our WAP Tutorial!</p>
</card>
</wml>
The result MIGHT look like this in your mobile phone display (note that only one card is
displayed at a time):
——— Card 1 ———
Hello World!
Card

It is a single unit of WML navigation, which often directs to one screen of viewed content but
could work on a step that is not displayed.
Deck

Some important points about a deck are highlighted below.
 It is analogous to an HTML page in that it is the unit of content transmission.
 Decks are to WML identical as documents are to HTML.

 WML decks are XML documents.
 Decks send requests for services and/or to be carried out on servers.
 Decks comprises of component known as “cards”.
 Each deck must have at least one card.
The device browser accesses and open a deck and reads the cards within the deck. Navigation
traverses from card within a deck. Once loaded, the deck resides in device’s memory.
Each deck starts with the <wml> tag and ends with the </wml> tag. Within these decks, every
card starts with the <card> tag and ends with the </card> tag.

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