i want to change just the name of hr.department form, i declared a view form like this in my custom module.

         record id="view_hr_department_inherit" model="ir.ui.view">

                    <field name="name">view.hr.department.inherit</field>

                    <field name="model">hr.department</field>

                    <field name="inherit_id" ref="hr.view_department_form"/>

                    <field name="arch" type="xml">

                        <xpath expr="//form@name='Department']" position="replace" >

                        <field name="name" string="New_name"/>

                        </xpath>

                     </field>

            </record>

and i receive this error 

                odoo.tools.convert.ParseError: "Invalid expression"