<?xml version="1.0" encoding="US-ASCII"?>
<xs:schema targetNamespace="http://xbrl.sec.gov/exch-ent-std/2017-01-31"
xmlns:link="http://www.xbrl.org/2003/linkbase"
xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric"
xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
xmlns:xbrli="http://www.xbrl.org/2003/instance"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" elementFormDefault="qualified"
xmlns:exch="http://xbrl.sec.gov/exch/2017-01-31"
xmlns:exch-ent-std="http://xbrl.sec.gov/exch-ent-std/2017-01-31"
xmlns:exch-std="http://xbrl.sec.gov/exch-std/2017-01-31">
<xs:annotation>
<xs:appinfo>
<link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="exch-pre-2017-01-31.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" />
<link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="exch-def-2017-01-31.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" />
</xs:appinfo>
</xs:annotation>
<xs:import schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/instance" />
<xs:import schemaLocation="exch-std-2017-01-31.xsd" namespace="http://xbrl.sec.gov/exch-std/2017-01-31" />
<xs:import schemaLocation="exch-2017-01-31.xsd" namespace="http://xbrl.sec.gov/exch/2017-01-31" />
<xs:import schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" namespace="http://xbrl.org/2005/xbrldt" />
</xs:schema>
