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' For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
' initialize PngFormat
Dim pngFormat As New PngFormat(Common.MapSourceFilePath(filePath))

' get XMP data
Dim xmpProperties As XmpProperties = pngFormat.GetXmpProperties()

If xmpProperties IsNot Nothing Then
    ' show XMP data
    For Each key As String In xmpProperties.Keys
        Dim xmpNodeView As XmpNodeView = xmpProperties(key)
        Console.WriteLine("[{0}] = {1}", xmpNodeView.Name, xmpNodeView.Value)
    Next
Else
    Console.WriteLine("No XMP data found.")