'Get the representation of a field value
@param table: the database table
@param f: the field name
@param v: the value'

def represent(self, table, f, v):

    if (f in (self.CUSER, self.MUSER, self.OUSER)):
        represent = current.cache.ram(('auth_user_%s' % v), (lambda : self.represent_user(v)), time_expire=60)
    elif (f in self.OGROUP):
        represent = current.cache.ram(('auth_group_%s' % v), (lambda : self.represent_role(v)), time_expire=60)
    else:
        represent = s3_represent_value(table[f], value=v, strip_markup=True)
    return represent
