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// For complete examples and data files, please go to https://github.com/groupdocs-metadata/GroupDocs.Metadata-for-.NET
// initialize TiffFormat
TiffFormat tiff = new TiffFormat(Common.MapSourceFilePath(filePath));

// get xmp
XmpPacketWrapper xmpPacket = tiff.GetXmpData();

if (xmpPacket != null)
{
    // show XMP data
    XmpProperties xmpProperties = tiff.GetXmpProperties();

    // show XMP data
    foreach (string key in xmpProperties.Keys)
    {
        try
        {
            XmpNodeView xmpNodeView = xmpProperties[key];
            Console.WriteLine("[{0}] = {1}", xmpNodeView.Name, xmpNodeView.Value);
        }
        catch { }
    }
}
else
{
    Console.WriteLine("No XMP data found.");
}