This example was written in answer to the question How can I generate a PDF/UA compatible PDF with iText?
pdfua
##GITHUB:https://github.com/itext/i7js-examples/blob/develop/src/main/java/com/itextpdf/samples/sandbox/pdfua/PdfUA.java##
##GITHUB:https://github.com/itext/i7ns-samples/blob/develop/itext/itext.samples/itext/samples/sandbox/pdfua/PdfUA.cs##
Results
cmp_pdf_ua.pdf