<div dir="ltr">PDF/A-3 makes only a single, fairly monumental change. In the PDF/A-2 specification users were allowed to embed files, but only PDF/A files. PDF/A-3 now allows the embedding of any arbitrary file format, including XML, CSV, CAD, images and any others.<br>
<br>At first glance this sounds like a gigantic betrayal of everything that the format has stood for. Why define a subset of PDF attributes to ensure the long-term comprehension of the file if you’re going to turn around and allow the kitchen sink to be embedded within it?<div>
<br><a href="http://blogs.loc.gov/digitalpreservation/2012/11/all-in-embedded-files-in-pdfa/?loclr=blogsig">http://blogs.loc.gov/digitalpreservation/2012/11/all-in-embedded-files-in-pdfa/?loclr=blogsig</a></div><div><br></div>
<div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">This is very bad news for digital preservation because it is now possible to "hide" proprietary digital inside the PDF/A digital container. What will future researchers think when they stumble upon these "hidden" closed formats that they will not be able to use?</div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">What were they thinking??</div><br></div></div>