WapTV

WapTV is an interactive TV technology platform comprising a microbrowser, a markup language, and a significant collection of associated software tools and services. Further information, training and support is available from the Sky Interactive Developers' Programme. See [1] (http://waptv.com) for details.

The microbrowser and markup language are both based upon the WAP Forum WML 1.3 specification. The waptv microbrowser is currently available only as an OpenTV application, although an MHP version of the waptv browser has been built for demonstration and proof of concept. An emulator exists, based on Craftwork's, STBe OpenTV middleware emulation, but ongoing licensing issues between OpenTV and Craftwork prevent its distribution.

The WTVML markup language is a heavily extended superset of the WAP Forum WML 1.3 specification. WML content originally designed for wireless delivery to mobile phone handsets will work without modification on the Sky Interactive waptv platform, with the exception that any WBMP images will not appear on the Sky Interactive waptv microbrowser. WTVML version 6.1 was published as an ETSI standard in June 2004, and is now available for download from [2] (http://webapp.etsi.org/action%5CPU/20040518/ts_102322v010101p.pdf). The waptv schema definitions are available from [3] (http://waptv.com/xsd). Errors, bugs, change and feature requests can be directed to the waptv Bugzilla at [4] (http://waptv.com/bugzilla)

The waptv browser and the wtvml markup language were originally developed by WAPTV Ltd. The company and its technology was acquired by British Sky Broadcasting in 2001. Platform development has continued within BSkyB, and version 7 of the waptv browser and WTVML markup language is due for release in Q3 2004. The waptv browser and WTVML markup is now the cornerstone of British Sky Broadcasting's interactive platform strategy.

The waptv platform brings internet-style content and interactivity to the Sky Digital platform by deploying a purpose-built WML microbrowser to the Sky Digital set-top-box over the satellite broadcast stream.

Services for the OpenTV based Microbrowser are written in WTVML, a superset of WML. The Sky Interactive microbrowser uses a standard 28.8 kbit/s modem to pull content across the online link. Because wtvml content is compiled into an encoded format by the OLS before transmission, it must be decoded on the set-top-box before it can be drawn to the screen. For optimal performance it is recommended that wtvml files (decks) for download are no more than 70 K in size, with individual cards within each deck no more than 5 K in size. When fully loaded, the browser comprises three separate virtual layers, devoted to MPEG & JPG still image presentation, MPEG video presentation and OnScreen Display (OSD) presentation respectively.

Developers can combine modes to produce very rich and diverse interactive TV interfaces. Multiple modes can be defined as a modeset. Different modes in the modeset can be referenced from the WML cards and associated with service domains, allowing the browser to change its style as the user navigates from one service to another. A modeset is a collection of one or more modes defined in a standalone XML file. A modeset is referenced at deck level from the mode attribute of the wml element. A developer can define multiple modes within a single modeset, and can initiate changes between Modes within that Modeset at card level.

The microbrowser can access Broadcast Resources as well as online resources delivered from a WML enabled Web server. Broadcast Resources are content elements that are delivered in the satellite broadcast stream.

A doset can be used to specify a set of menu dos that can be easily applied to many cards and across many services. The doset is defined in an XML file that is referenced from the dosrc attribute of the modeset element. A single doset can be referenced by multiple modesets, and so can easily be applied across multiple domains and services.

The names and locations of font resources for use within a service are defined by an XML document usually called fontset.xml. This document must be available from a URL, and is referred to from the fontsrc attribute of the WML.

<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.2//EN" "http://www.wapforum.org/DTD/wml_1.1.xml">

<modeset fontsrc='helloWorld_fontset.xml'>
<head>
   <meta http-equiv="Cache-Control" content="no-cache" forua="true" />
</head> 

<mode id='helloWorld' bgimage='bg_helloWorld.mpg.mpg'>
	
	<av mode='blank'/>

	<callrate rect="575,518,668,637" align="tl" font="callrate" aacolor="#0e1d5a" visible="true"/>
	<status rect="548,518,668,637" align="tl" visible="true" />	
	
	<menu visible="false">
 	</menu>
                
	<browser id='main' rect='50,90,668,546'>
		<scroll bgcolor='#10105A' bgfocused='#10105A' fgcolor='#39617b' fgfocused='#5a9cad' />
		<input bgcolor='#C8C8C8' borderwidth='2' cursorcolor='#808080' 
bordercolor='#000000' borderunfocused='#745619' borderfocused='#808080'>
			<scroll bgcolor='#10105A' bgfocused='#10105A' 
fgcolor='#39617b' fgfocused='#5a9cad' />
		</input>
		<title rect='78,147,363,182' aacolor='#848484' font='title' align='bl' visible="true"/>
	</browser> 
</mode>


</modeset>

<!DOCTYPE wml PUBLIC "-//SKYINTERACTIVE//DTD wtvml 1.0//EN" "http://waptv.com/DTD/wtvml_1.0.dtd">
<wml mode='helloWorld_modeset.xml'>
<head>
	<meta http-equiv="Cache-Control" content="no-cache" forua="true" />
</head>

<card id="index" newcontext='true' paragap='10' mode='#helloWorld'>

<p>
<table columns='1'>
	<tr>
		<td height='12'> </td>
	</tr>
	<tr>
		<td>Hello World!</td>
	</tr>
</table>
</p>

</card>
</wml>

External links

• Official BSkyB WapTV site (http://www.waptv.com)
• Unofficial WapTV developer's site (http://www.waptvdevelopment.co.uk)
• WapTV Jobs (http://www.dtvjobs.co.uk/wikipedia/wapTV)