Inside <shop> information is given where an equipment part was purchased.
Preferably, all <shop> elements are gathered inside the <business> section, so that they afterwards may easily be cross-referenced via <link/>.
<purchase>
(see also <purchase>)
<shop id="shop_the-deepdivers">
    <name>The DeepDivers</name>
    <address>
        <!-- address data of shop where the equipment part was bought -->
    </address>
    <contact>
        <!-- additional contact data (phone number, email address etc.) -->
    </contact>
    <notes>
        <!-- additional remarks, pictures etc. -->
    </notes>
</shop>