I'm trying to create a template which references variables from the meta plugin, but either it's not supported or I'm doing something wrong. This is what my template looks like:

<div class="attributionbox">
<p><b>Written by:</b> <a href="<TMPL_VAR AUTHORURL>"><TMPL_VAR AUTHOR></a></p>
<p><TMPL_VAR text></b></p>

The template is working because I get the content, but all the places where I reference meta variables are blank. Is this supposed to work or am I trying to do something unsupported? Many thanks for any pointers.