<?xml version="1.0" encoding="US-ASCII"?>
<xs:schema targetNamespace="http://xbrl.sec.gov/currency-pre/2017-01-31" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:currency-pre="http://xbrl.sec.gov/currency-pre/2017-01-31" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:currency="http://xbrl.sec.gov/currency/2017-01-31" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrli="http://www.xbrl.org/2003/instance">
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xlink:type="simple" xlink:href="currency-pre-2017-01-31.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/>
    </xs:appinfo>
  </xs:annotation>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/currency/2017-01-31" schemaLocation="currency-2017-01-31.xsd"/>
</xs:schema>