<openerp>
<data>
<template id="assets_common" name="your_module_name assets" inherit_id="web.assets_common">
<xpath expr="." position="inside">
<link rel='stylesheet' href="/your_module_name/static/src/css/your_file.css"/>
<script type="text/javascript" xx_src="/your_module_name/static/src/js/your_file.js"></script>
</xpath>
</template>
</data>
</openerp>