@Pascal

Because every class that inherit from rml_parse, it's inheriting the __init__ method too, and if that class does not override the __init__ method it will be called or also like the case of Overdue class it's calling the super

super(Overdue, self).__init__(cr, uid, name, context=context)

The __init__ method of the rml_parse creates the localecontext with this code:

self.localcontext = {
    'user': user,
    'setCompany': self.setCompany,
    'repeatIn': self.repeatIn,
    'setLang': self.setLang,
    'setTag': self.setTag,
    'removeParentNode': self.removeParentNode,
    'format': self.format,
    'formatLang': self.formatLang,
    'lang' : user.company_id.partner_id.lang,
    'translate' : self._translate,
    'setHtmlImage' : self.set_html_image,
    'strip_name' : self._strip_name,
    'time' : time,
    'display_address': self.display_address,
    # more context members are setup in setCompany() below:
    #  - company_id
    #  - logo
}