Create Select Tag. See below example:
<field name="shippingstatus">
<title>Shipping Status</title>
<type>selectTag</type>
<options>
<option value="Active">Active</option>
<option value="Inactive">Inactive</option>
</options>
<selected>Active</selected>
<db-attribute>
<attribute name="type ">enum</attribute>
<attribute name="length"></attribute>
<attribute name="null"></attribute>
<attribute name="default"></attribute>
</db-attribute>
<tag-attributes>
<attribute name="id">shipping-status</attribute>
</tag-attributes>
</field>
Options:
Option tag contain the selectable options. Each option two parameter Value and Label. Like bellow
<option value="[VALUE]">[LABLE]</option>
See bellow example:
<option value="Active">Active</option>