Importing custom xml for tags

[manchuwook]

I figure I'm trying to do something pretty straightforward:

<?xml version="1.0" encoding="utf-8"?>
<export xmlns="urn:lonewolfdevel.com:realm-works-export" format_version="3" is_structure_only="true" game_system_id="2">
	<definition>
		<details name="Ackerman Puglisi Traits" abbrev="apTraits" import_tag_id="Tag_1"/>
		<content_summary max_domain_count="1" max_category_count="1" />
	</definition>
	<structure>
		<domain name="Positive Traits" abbrev="appostrait">
			<tag_global name="adaptable" />
...
			<tag_global name="over-sensitive" />
		</domain>
	</structure>
</export>

Except I'm getting either a 'Divide by 0' error message or an 'Object reference not set to an instance of an object.' Can someone tell me what the mandatory elements and attributes for an import need to be? I'm told that UUIDs should be excluded, but do I need to have tag_ids or anything else?