METS file that illustrates how mets.rb makes the selection of the wrong structmap, in this case a PDF.

gistfile1.xml

<METS:mets LABEL="Fire Careers, Adventures For Your Life!" OBJID="FI06050102" xmlns:METS="http://www.loc.gov/METS/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:mods="http://www.loc.gov/mods/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/version14/mets.xsd http://purl.org/dc/elements/1.1/ http://dublincore.org/schemas/xmls/simpledc20021212.xsd http://www.loc.gov/mods/v3 http://www.loc.orv/standards/mods/v3/mods-3-0.xsd" TYPE="book">

  <METS:metsHdr CREATEDATE="2010-03-15T13:03:48-04:00">
    <METS:agent OTHERROLE="METS Maker" OTHERTYPE="SOFTWARE" ROLE="OTHER" TYPE="OTHER">
      <METS:name>DigiTool METS Maker</METS:name>
    </METS:agent>
  </METS:metsHdr>

  <METS:dmdSec ID="DMD1">
    <METS:mdWrap MDTYPE="MARC" MIMETYPE="text/xml">
      <METS:xmlData>

<record xmlns="http://www.loc.gov/MARC21/slim" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/MARC21/slim http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd">
  <leader>     nam  2200181Ka 4500</leader>
  <controlfield tag="001">000019560</controlfield>
  <controlfield tag="006">m|||||||||||||||||</controlfield>
  <controlfield tag="007">cr||||||||||||</controlfield>
  <controlfield tag="008">060614s||||||||||||||| s||||||   ||eng||</controlfield>
  <datafield tag="035" ind1=" " ind2=" ">
    <subfield code="a">(IID)FI06050102</subfield>
  </datafield>
  <datafield tag="035" ind1="9" ind2=" ">
    <subfield code="a">AAC0112  QF</subfield>
  </datafield>
  <datafield tag="245" ind1="1" ind2="0">
    <subfield code="a">Fire Careers, Adventures For Your Life!</subfield>
    <subfield code="h">[electronic resource]</subfield>
  </datafield>
  <datafield tag="533" ind1=" " ind2=" ">
    <subfield code="a">Electronic reproduction.</subfield>
    <subfield code="b">[Florida] :</subfield>
    <subfield code="c">State University System of Florida, PALMM Project,</subfield>
    <subfield code="d">2006.</subfield>
    <subfield code="n">Mode of access: World Wide Web.</subfield>
    <subfield code="n">Electronic version created 2006, State University System of Florida.</subfield>
  </datafield>
  <datafield tag="852" ind1=" " ind2=" ">
    <subfield code="b">FEOL</subfield>
  </datafield>
  <datafield tag="852" ind1=" " ind2=" ">
    <subfield code="b">EOL</subfield>
  </datafield>
  
  
  <datafield tag="998" ind1="7" ind2="7">
    <subfield code="b">Book</subfield>
  </datafield>
  <datafield tag="998" ind1="7" ind2="7">
    <subfield code="b">Online Resource</subfield>
  </datafield>
  <datafield tag="598" ind1=" " ind2=" ">
    <subfield code="a">FI06050102</subfield>
  </datafield>
</record>
      </METS:xmlData>
    </METS:mdWrap>
  </METS:dmdSec>

  <METS:fileSec>
    <METS:fileGrp USE="reference">
      <METS:file GROUPID="GID1" ID="FID1" SEQ="1" MIMETYPE="image/jpeg">
        <METS:FLocat LOCTYPE="OTHER" OTHERLOCTYPE="SYSTEM" xlink:href="1029806_FI06050102_001.jpg" />
      </METS:file>
      <METS:file GROUPID="GID2" ID="FID2" SEQ="2" MIMETYPE="image/jpeg">
        <METS:FLocat LOCTYPE="OTHER" OTHERLOCTYPE="SYSTEM" xlink:href="1029807_FI06050102_002.jpg" />
      </METS:file>
    </METS:fileGrp>

    <METS:fileGrp USE="reference">
      <METS:file GROUPID="GID3" ID="FID3" SEQ="3" MIMETYPE="application/pdf">
        <METS:FLocat LOCTYPE="OTHER" OTHERLOCTYPE="SYSTEM" xlink:href="1029808_file1.pdf" />
      </METS:file>
      <METS:file GROUPID="GID4" ID="FID4" SEQ="4" MIMETYPE="application/pdf">
        <METS:FLocat LOCTYPE="OTHER" OTHERLOCTYPE="SYSTEM" xlink:href="1029809_file2.pdf" />
      </METS:file>
      <METS:file GROUPID="GID5" ID="FID5" SEQ="5" MIMETYPE="application/pdf">
        <METS:FLocat LOCTYPE="OTHER" OTHERLOCTYPE="SYSTEM" xlink:href="1029810_file3.pdf" />
      </METS:file>
    </METS:fileGrp>
  </METS:fileSec>


  <METS:structMap LABEL="View" TYPE="JPEG">
    <METS:div DMDID="DMD1" LABEL="Fire Careers, Adventures For Your Life!">
        <METS:div LABEL="Fire Careers, Adventures For Your Life!" TYPE="chapter">
          <METS:div LABEL="Recto" TYPE="chapter">
            <METS:div LABEL="FI06050102_001" TYPE="page">
              <METS:fptr FILEID="FID1"/>
            </METS:div>
          </METS:div>
          <METS:div LABEL="Verso" TYPE="chapter">
            <METS:div LABEL="FI06050102_002" TYPE="page">
              <METS:fptr FILEID="FID2"/>
            </METS:div>
          </METS:div>
        </METS:div> 
    </METS:div>
  </METS:structMap>
</METS:mets>

This mets.xml file is from FIU, /ssa/d2i/FIU_FEOL_books_dumpB/FI06050102/ and is associated with issue

FLVC/offline-ingest#20