openerp - How can i change the field name based on condition in xml file? -

how can change field name based on condition in xml file?

my code is:

<field name="parent_id" position="attributes">         <attribute name="string">{'hod':[('is_student','=',true)]}</attribute>     </field> 

if field is_student true, show hod otherwise keep manager only.

how achieve it?

as not able in xml file, because if try @odedra solution, design getting disturbed.

i'm achieve code:

def fields_get(self, cr, uid, fields=none, context=none):     if context none:         context={}     res = super(hr_employee, self).fields_get(cr, uid, fields, context)     if 'parent_id' in res , 'is_student' in context , context['is_student']:         if 'string' in res['parent_id']:             res['parent_id']['string'] = 'hod'     return res