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

WML <head> tag

The <head> tag contains information about the document.

Note: The following tags can go in the head element: <access> and <meta>.

Syntax

<head>
..<access>..
..<meta>..
</head>

Attribute	Value	Description
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>
   <access domain="www.w3schools.com"/>
   <meta name="keyword" content="WAP"/>
</head>

....
....
</wml>