Technical metadata for images

Technical metadata is metadata about a component of the METS object, such as a digital content file. One might, for example, have a <md> element which includes technical metadata regarding a file’s preparation:

TODO use current version of NISO/MIX schema

<mets:md ID="AMD001" USE="TECHNICAL">
  <mets:mdWrap MIMETYPE="text/xml" MDTYPE="NISOIMG" LABEL="NISO Img.Data">
    <mets:xmlData>
      <niso:MIMEtype>image/tiff</niso:MIMEtype>
      <niso:Compression>LZW</niso:Compression>
      <niso:PhotometricInterpretation>8
      </niso:PhotometricInterpretation>
      <niso:Orientation>1</niso:Orientation>
      <niso:ScanningAgency>NYU Press</niso:ScanningAgency>
    </mets:xmlData>
  </mets:mdWrap>
</mets:md>

Within a file section, a <file> element within a <fileGrp> might then identify the administrative metadata pertaining to the file to which it points by referencing an MDID attribute for its <md> element:

<mets:file ID="FILE001" MDID="AMD001">
  <mets:FLocat LOCTYPE="URL" LOCREF="http://dlib.nyu.edu/press/testing.tif"/>
</mets:file>

Below, there are links to a few technical metadata standards:

• MIX XML Schema
• NISO Technical Metadata for Still Images
• TextMD
• AudioMD and VideoMD