How to fetch xml inside an xml

Hi I want to fetch whole <request> tag ie all the things including tags and their values in xml format .Can i do it in java using any of the XML parsers?

XML FILE

<?xml version="1.0" encoding="UTF-8"?>
    <apis xmlns:xsi="http://ift.tt/ra1lAU"
        xsi:noNamespaceSchemaLocation="vdb-api-config.xsd">
        <api>
            <serviceName>Billing</serviceName>
            <methodName>getBilling</methodName>
            <request>
      <com.shared.to.wireline.Billing>
      <billingPk>
        <lsBanPk>
          <lsBan>17957</lsBan>
          <divisionId>PZA</divisionId>
          <systemId>OPWQ</systemId>
        </lsBanPk>
        <btnPk>
          <btn>6184</btn>
          <custCode>1</custCode>
          <divisionId>ILEPOR</divisionId>
          <systemId>ACSQQWE</systemId>
        </btnPk>
        <attProductType>UVERSE_STANDALONE</attProductType>
      </billingPk>
    </com.shared.to.wireline.Billing>
        </request>
        </api>
    </apis>