How to make dynamic result in META varriable in perl template toolkit

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http:/
+/www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
...
        <title>[%template.title]</title>
        <meta name="generator" content="Ipad2 and iphone accesories" /
+>
        <meta name="author" content="cloudsandcolors.com" />

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[%Meta
title = 'This is my heading'
%]

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[%META 
title = '$varriable'
-%]

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