WML learning (1): Overview and basic rules

Summary WML (WirelessMarkupLanguage-Wireless Markup Language) is the same language as the HTML language we often hear. it belongs to the XML language family. For HTML-based content, we can use IE or Netscap on our PC.
WML (Wireless Markup Language-Wireless Markup Language) is the same Language as the commonly heard HTML Language. it belongs to the x ml Language family. The content written in HTML can be viewed in IE, Netscape, and other browsers on our PC, WML language files are specially used for display on wireless terminal display devices such as mobile phones for browsing. They can also provide human-computer interaction interfaces to users, receive the query information input by the application, and then return the ultimate information he wants to obtain to the application.

Basic rules
* WML uses the XML document character set and currently supports Unicode 2.0. Unlike HDML, all WML labels, attributes, and specified acceptable values must be in lowercase, CARD names and variables are also case sensitive. Like HDML, only one space is displayed for consecutive null characters. The attribute values in the tag must be enclosed by 'or'. there cannot be spaces between the attribute names, =, and values. For tags that are not displayed in pairs, you must add/Before>, such
. The reference to variables is similar to that of HDML, including:
$ (Var1: esc)
$ (Var1: noesc)
$ (Var1: unesc)
For more information about the three situations, see the relevant section of HDML. The processing of reserved characters is also similar. the corresponding replace characters include:
<
>
''
'"
&&
$
Space
-­
It should be pointed out that during the URL transfer process, the & must be converted to & used to connect parameters &.