<?xml version="1.0"?>
<data>
    <xpath expr="/tree/field[@name='certified']" position="after">
        <field name="common_name"/>
        <field name="chemical_name"/>
        <field name="commercial_name"/>
        <field name="cas_number"/>
        <field name="commercial_brand"/>
        <field name="purity_degree"/>
        <field name="family_equivalent"/>
        <field name="controlled"/>
        <field name="reference_material"/>
        <field name="certified"/>
        <field name="catalog"/>
        <field name="barcode"/>
    </xpath>
</data>
