<?xml version="1.0"?>
<data><xpath expr="//field[@name='tax_ids']" position="attributes">
                <attribute name="optional">show</attribute>
            </xpath>
            <xpath expr="//field[@name='tax_tag_ids']" position="attributes">
                <attribute name="optional">show</attribute>
            </xpath>
            <xpath expr="//field[@name='matching_number']" position="attributes">
                <attribute name="optional">hide</attribute>
            </xpath>
        </data>