public static void SetPrefixMetadata()
{
// ExStart:SetPrefixMetadata
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();
// Open document
Document pdfDocument = new Document(dataDir + "SetXMPMetadata.pdf");
pdfDocument.Metadata.RegisterNamespaceUri("xmp", "http:// Ns.adobe.com/xap/1.0/"); // Xmlns prefix was removed
pdfDocument.Metadata["xmp:ModifyDate"] = DateTime.Now;
dataDir = dataDir + "SetPrefixMetadata_out.pdf";
// Save document
pdfDocument.Save(dataDir);
// ExEnd:SetPrefixMetadata
}
}