adding images dynamically to an openerp rml report file

I want to do something like this in a openerp report, how would I need to go about to create this file path:

<image file="images\[[o.name]]" x="72" y="72"/>

Are there ways to create variables in rml that I could then feed to the file= attribute.

I have little to no python knowledge, but would love to get this solved.

Right now I am trying to adjust the order.rml, I can load images, but only statically ...

In the reports .py file add a python function like this:

self.localcontext.update({
            'time': time,
            'image_url' : self._get_imagepath,
        })

def _get_imagepath(self,product):
        attach_ids = self.pool.get('ir.attachment').search(self.cr, self.uid, [('res_model','=','product.product'), ('res_id', '=',product)])
        datas = self.pool.get('ir.attachment').read(self.cr, self.uid, attach_ids)
        if len(datas):
            # if there are several, pick first
            try:
                if datas[0]['link']:
                    try:
                        img_data =  base64.encodestring(urllib.urlopen(datas[0]['link']).read())
                        return img_data
                    except Exception,innerEx:
                        print innerEx
                elif datas[0]['datas']:
                    return datas[0]['datas']
            except Exception,e:
                print e
        return None

in the rml itself call the function as such:

<para>[[ image_url(o['id']) and setTag('para','image') or removeParentNode('para') ]][[ image_url(o['id']) ]]</para>