From http://www.w3schools.com (Copyright Refsnes Data)

WML <meta> tag

The <meta> tag provides meta-information about the WML document.

Note: The <meta> tag always goes inside the head element.

Syntax

<head>
<meta/>
</head>

Attribute	Value	Description
content	cdata	Should specify a description of the name attribute
forua	true false	Specifies if the meta data is sent to the browser. If set to true the meta data must be sent to the browser
http-equiv	cdata	Sets whether the content of the <meta> tag is bound to an http response header
name	cdata	Should specify a name for something you want to describe on the page. Could be "keywords", "author", etc.
scheme	cdata	Specifies the structure used to translate the meta data
class	cdata	Sets a class name for the element. The class name is case sensitive. An element can be connected to multiple classes. Multiple class names within the class attribute are separated by white space
id	id	Sets a unique name for the element

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

<wml>
<head>
 <meta name="keyword" content="WAP"/>
 <meta http-equiv="cache-control" content="no-cache"/>
</head>
....
</wml>