Minimal METS example that shows how to link mets:div element to both digiprovMD and sourceMD elements

mets-test-minimal.xml

<mets:mets xmlns:mets="http://www.loc.gov/METS/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:premis="http://www.loc.gov/premis/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/METS/ http://www.loc.gov/standards/mets/mets.xsd http://www.loc.gov/mods/v3 https://www.loc.gov/standards/mods/v3/mods-3-4.xsd http://www.loc.gov/premis/v3 https://www.loc.gov/standards/premis/premis.xsd">
  <mets:dmdSec ID="dmdSec_1">
    <mets:mdWrap MDTYPE="MODS" MDTYPEVERSION="3.4">
      <mets:xmlData>
        <mods:mods>
          <mods:titleInfo>
            <mods:title>My Enhanced CD</mods:title>
          </mods:titleInfo>
          <mods:name>
            <mods:namePart>Snot, Piet</mods:namePart>
          </mods:name>
        </mods:mods>
      </mets:xmlData>
    </mets:mdWrap>
  </mets:dmdSec>
  <mets:amdSec ID="amdSec_1">
    <mets:techMD ID="techMD_1">
      <mets:mdWrap MIMETYPE="text/xml" MDTYPE="PREMIS:OBJECT" MDTYPEVERSION="3.0">
        <mets:xmlData>
        </mets:xmlData>
      </mets:mdWrap>
    </mets:techMD>
    <mets:techMD ID="techMD_2">
      <mets:mdWrap MIMETYPE="text/xml" MDTYPE="PREMIS:OBJECT" MDTYPEVERSION="3.0">
        <mets:xmlData>
        </mets:xmlData>
      </mets:mdWrap>
    </mets:techMD>
    <mets:sourceMD ID="sourceMD_1">
    </mets:sourceMD>
    <mets:digiprovMD ID="digiprovMD_1">
      <mets:mdWrap MIMETYPE="text/xml" MDTYPE="PREMIS:EVENT" MDTYPEVERSION="3.0">
        <mets:xmlData>
        </mets:xmlData>
      </mets:mdWrap>
    </mets:digiprovMD>
   </mets:amdSec>
  <mets:fileSec>
    <mets:fileGrp>
      <mets:file ID="file_1" SIZE="4102411" MIMETYPE="audio/flac" CHECKSUM="6bc4f0a53e9d866b751beff5d465f5b86a8a160d388032c079527a9cb7cabef430617f156abec03ff5a6897474ac2d31c573845d1bb99e2d02ca951da8eb2d01" CHECKSUMTYPE="SHA-512" ADMID="techMD_1">
        <mets:FLocat LOCTYPE="URL" xlink:href="file:///cd-rom/1/01.flac"/>
      </mets:file>
      <mets:file ID="file_2" SIZE="31764480" MIMETYPE="application/x-iso9660-image" CHECKSUM="783ae6ac53eba33b8ab04363e1159a71a38d2db2f8004716a1dc6c4e11581b4311145f07834181cd7ec77cd7199377286ceb5c3506f0630939112ae1d55e3d47" CHECKSUMTYPE="SHA-512" ADMID="techMD_2">
        <mets:FLocat LOCTYPE="URL" xlink:href="file:///cd-rom/1/ELL2.iso"/>
      </mets:file>
    </mets:fileGrp>
  </mets:fileSec>
  <mets:structMap>
    <mets:div TYPE="physical" LABEL="volumes" DMDID="dmdSec_1">
      <mets:div TYPE="cd-rom" ORDER="1" ADMID="digiprovMD_1 sourceMD_1">
        <mets:div TYPE="audio track" ORDER="1">
          <mets:fptr FILEID="file_1"/>
        </mets:div>
        <mets:div TYPE="disk image" ORDER="2">
          <mets:fptr FILEID="file_2"/>
        </mets:div>
      </mets:div>
    </mets:div>
  </mets:structMap>
</mets:mets>