Advanced PDF/HTML Templates allow creating customizable printing templates using a markup language very similar to HTML. The feature is based on BFO library and its full reference guide can be found here: http://bfo.com/products/report/docs/tags/
<center> HTML tag is not supported in Advanced PDF/HTML Templates. Here are some code examples for centering text in forms:
1) Create a new paragraph with centered text:
<pdf>
<body>
<p>this text is not centered</p>
<p align="center">this text is centered</p>
</body>
</pdf>
2) Create a new paragraph using CSS:
<pdf>
<head>
<style type="text/css">
.centered { align: center }
</style>
</head>
<body>
<p>this text is not centered</p>
<p class="centered">this text is centered</p>
</body>
</pdf>