Thanks for your patience. We have further investigated the issue and found that you should use namespace name without prefix. Please
take a look on following code snippet. Hopefully it will help you to accomplish the requirements.
pdfDocument.Metadata.RegisterNamespaceUri(“xmp”,“http://ns.adobe.com/xap/1.0/”); // xmlns prefix removed pdfDocument.Metadata[“xmp:ModifyDate”] = DateTime.Now;
Please feel free to contact us for any further assistance
ajirahmanKeelath:1. Convert a pdf to PDF/A-3 with compliance-level (3a, 3b, 3u)
ajirahmanKeelath:2. Insert a xmp file as metada into the converted PDF/A-3.
The issues you have found earlier (filed as PDFNEWNET-36439) have been fixed in Aspose.Pdf for .NET 9.1.0.
For further details, you may check this blog post.
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