The current Exiv2 based extractor does not extract XMP Metadata from Image files.
Created attachment 85083 [details] Sample image with XMP metadata (DwC) A (small) sample of XMP tags seen in the sample image using exiv2 -px Xmp.dc.format XmpText 10 image/jpeg Xmp.dc.rights LangAlt 1 lang="x-default" © Corbis. All Rights Reserved. Xmp.dc.creator XmpSeq 1 Corbis Xmp.exif.DateTimeDigitized XmpText 29 2008-03-14T11:31:48.098-07:00 Xmp.exif.DateTimeOriginal XmpText 25 2008-03-14T13:59:26-06:00 Xmp.xmp.MetadataDate XmpText 29 2013-02-07T21:56:33.820-06:00 Xmp.dwc.Record/dwc:basisOfRecord XmpText 14 FossilSpecimen Xmp.dwc.Occurrence/dwc:sex XmpText 6 female Xmp.dwc.Occurrence/dwc:lifeStage XmpText 3 egg Xmp.dwc.dctermsLocation/dwc:continent XmpText 10 Antarctica Xmp.dwc.dctermsLocation/dwc:verbatimCoordinates XmpText 20 41 05 54S 121 05 34W Xmp.dwc.Taxon/dwc:scientificName XmpText 19 Ctenomys sociabilis
This is the information currently extracted from the sample file: /home/stefan/Downloads/DwC-SampleImage.jpg image/jpeg Exiv2Extractor For <...> Artist: Corbis (QString) Document Generated By: http://www.idimager.com (QString) Copyright: © Corbis. All Rights Reserved. (QString) Width: 1024 (uint) Height: 768 (uint) Image Date Time: 2008-03-14T13:59:26.000Z (QDateTime) Image Orientation: 1 (int) X Dimension: 1024 (qlonglong) Y Dimension: 768 (qlonglong) Original Date Time: 2008-03-14T13:59:26.000Z (QDateTime) So XMP fields from Dublin Core (dc) and exif are extracted.