<?xml version="1.0" encoding="UTF-8"?>
<link:linkbase
	xmlns:detf="http://detf/20180301"
	xmlns:link="http://www.xbrl.org/2003/linkbase"
	xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
	xmlns:dei="http://xbrl.sec.gov/dei/2012-01-31"
	xmlns:rr="http://xbrl.sec.gov/rr/2012-01-31"
	xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:xbrli="http://www.xbrl.org/2003/instance"
	xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
	xmlns:xlink="http://www.w3.org/1999/xlink">

<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/Series" xlink:type="simple" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#SeriesOnly"/>
<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/Class" xlink:type="simple" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#ClassOnly"/>
<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/PerformanceMeasure" xlink:type="simple" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#PerformanceMeasureOnly"/>
<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/Prospectus" xlink:type="simple" xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#ProspectusOnly"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>

<!-- davis select us equity etf -->
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
	<link:loc xlink:type="locator"
		xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain"
		xlink:label="EntityDomain"/>
	<link:loc xlink:type="locator" xlink:href="detf-20180301.xsd#detf_S000055342Member"
		xlink:label="S000055342Member"/>
	<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
		xlink:from="EntityDomain"
		xlink:to="S000055342Member"
		order="1.0"/>
</link:definitionLink>

<!-- davis select us equity etf class -->
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
	<link:loc xlink:type="locator"
		xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain"
		xlink:label="ShareClassDomain"/>
	<link:loc xlink:type="locator" xlink:href="detf-20180301.xsd#detf_C000174138Member"
		xlink:label="C000174138Member"/>
	<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
		xlink:from="ShareClassDomain"
		xlink:to="C000174138Member"
		order="1.0"/>
</link:definitionLink>

<!-- davis select financial etf -->
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
	<link:loc xlink:type="locator"
		xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain"
		xlink:label="EntityDomain"/>
	<link:loc xlink:type="locator" xlink:href="detf-20180301.xsd#detf_S000055343Member"
		xlink:label="S000055343Member"/>
	<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
		xlink:from="EntityDomain"
		xlink:to="S000055343Member"
		order="1.3"/>
</link:definitionLink>

<!-- davis select financial etf class -->
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
	<link:loc xlink:type="locator"
		xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain"
		xlink:label="ShareClassDomain"/>
	<link:loc xlink:type="locator" xlink:href="detf-20180301.xsd#detf_C000174139Member"
		xlink:label="C000174139Member"/>
	<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
		xlink:from="ShareClassDomain"
		xlink:to="C000174139Member"
		order="1.3"/>
</link:definitionLink>

<!-- davis select worldwide etf -->
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
	<link:loc xlink:type="locator"
		xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain"
		xlink:label="EntityDomain"/>
	<link:loc xlink:type="locator" xlink:href="detf-20180301.xsd#detf_S000055344Member"
		xlink:label="S000055344Member"/>
	<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
		xlink:from="EntityDomain"
		xlink:to="S000055344Member"
		order="1.5"/>
</link:definitionLink>

<!-- davis select worldwide etf class -->
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
	<link:loc xlink:type="locator"
		xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain"
		xlink:label="ShareClassDomain"/>
	<link:loc xlink:type="locator" xlink:href="detf-20180301.xsd#detf_C000174140Member"
		xlink:label="C000174140Member"/>
	<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
		xlink:from="ShareClassDomain"
		xlink:to="C000174140Member"
		order="1.5"/>
</link:definitionLink>

<!-- davis select international etf -->
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Series">
	<link:loc xlink:type="locator"
		xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain"
		xlink:label="EntityDomain"/>
	<link:loc xlink:type="locator" xlink:href="detf-20180301.xsd#detf_S000061340Member"
		xlink:label="S000061340Member"/>
	<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
		xlink:from="EntityDomain"
		xlink:to="S000061340Member"
		order="1.7"/>
</link:definitionLink>

<!-- davis select international etf class -->
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/Class">
	<link:loc xlink:type="locator"
		xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_ShareClassDomain"
		xlink:label="ShareClassDomain"/>
	<link:loc xlink:type="locator" xlink:href="detf-20180301.xsd#detf_C000198594Member"
		xlink:label="C000198594Member"/>
	<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
		xlink:from="ShareClassDomain"
		xlink:to="C000198594Member"
		order="1.7"/>
</link:definitionLink>

<!-- indices -->

<!-- davis select financial etf index - s&p 500 -->
<!--
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
	<link:loc xlink:type="locator"
		xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain"
		xlink:label="PerformanceMeasureDomain"/>
	<link:loc xlink:type="locator" xlink:href="detf-20180301.xsd#detf_SnPIndexMember"
		xlink:label="SnPIndexMember"/>
	<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
		xlink:from="PerformanceMeasureDomain"
		xlink:to="SnPIndexMember"
		order="10.0"/>
</link:definitionLink>
-->

<!-- davis select worldwide etf index - wilshire us real estate index  -->
<!--
<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasure">
	<link:loc xlink:type="locator"
		xlink:href="http://xbrl.sec.gov/rr/2012/rr-2012-01-31.xsd#rr_PerformanceMeasureDomain"
		xlink:label="PerformanceMeasureDomain"/>
	<link:loc xlink:type="locator" xlink:href="detf-20180301.xsd#detf_WilsREIndexMember"
		xlink:label="WilsREIndexMember"/>
	<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
		xlink:from="PerformanceMeasureDomain"
		xlink:to="WilsREIndexMember"
		order="10.2"/>
</link:definitionLink>
-->

</link:linkbase>