Hide field in xpath exp odoo 9

Question

What is the best solution to hide field eg. partner_id in

<xpath expr=".">
        <field name="partner_id" />
</xpath>

Answer 1

<xpath expr="//field[@name='partner_id']" position="attributes">
       <attribute name="invisible">1</attribute>
</xpath>

Answer 2

This is the best way of hiding any field from the view.

<xpath expr="//field[@name='partner_id']" position="attributes">
    <attribute name="invisible">1</attribute>
</xpath>