Facebook
Twitter
YOUTUBE
LINKEDIN
XING
About the contributor
Duff Johnson

A veteran of the electronic document space, Duff Johnson is an independent consultant, Executive Director of the PDF Association and ISO Project co-Leader (and US TAG chair) for ISO 32000 and ISO 14289.
More contributions
PANEL “Five visions of a PDF future” at the PDF Days Europe 2018

Catherine Andersz (PDFTron), Richard Cohn (Adobe), Harald Grumser (Compart), Carsten Heiermann (Foxit) and Duff Johnson (PDF Association) present their ideas for the next 25 years of PDF.

Interview with Dietrich von Seggern, CEO of callas software, about PDF Days Europe 2018

Dietrich von Seggern, CEO of callas software, will be hosting a presentation titled “Text and fonts in PDF” at the PDF Days Europe 2018. In this Interview he gives some background information about it.

Interview with Ulrich Isermeyer, Sr. Business Development Manager, Adobe Systems GmbH, about PDF Days Europe 2018

Ulrich Isermeyer, Sr. Business Development Manager, Adobe Systems GmbH, will be hosting a presentation titled “The power of 3D PDF” at the PDF Days Europe 2018. In this Interview he gives some background information about it.

Six Questions to Duff Johnson, Executive Director at PDF Association

Our Executive Director Duff Johnson gives some personally information about his experience with the “PDF universe” and much more.

Interview with Kevin Willems, Software Engineer at iText Software, about PDF Days Europe 2018

Kevin Willems, Software Engineer at iText Software, will be hosting a presentation titled “Redaction in electronic documents” at the PDF Days Europe 2018. In this interview Kevin gives some background information about it.

The Value of Tagged PDF


PDF was originally intended to serve as electronic paper; a properly rendered page irrespective of software or operating system.  Pages, however, aren’t just for reading. Since people like to add notes, draw lines and fill forms, Adobe Systems, the inventors of PDF, decided to cater to these uses as well. PDF rapidly accumulated new features beyond faithfulness to the rendered page – it began to mirror the interactive capabilities of real paper.

The first generation of interactive PDF features consisted of annotations of various types. Some allowed users to add text, others allowed users to draw lines and boxes onto the page. Still others go beyond the paradigm of the page, making it possible to add hyperlinks,  audio and movies to PDF.

The second generation of interactive PDF brought the ability to deploy a PDF’s content outside the page-based world.

Tagged PDF provides the means to effectively deploy a final-form document to a mobile device. It’s the same means by which PDF files may be made accessible to users who requires Assistive Technology (AT) to read.

One of the primary motivations for tagged PDF was to achieve compliance with regulations that require electronic documents to be accessible to users with disabilities, but implementers can leverage tagged PDF to accomplish or enhance a wide range of end user activities.

The following table indicates the utlity of untagged vs. tagged PDF content.

Untagged Content Tagged Content
No semantic types or ordering; content is ordered solely for rendering purposes Semantic type and order is determined, content may be reused accordingly
Search engines cannot reliably access words and phrases Search engines get reliable access to content.
No reliable means of reflowing page content onto smaller devices Includes information necessary for reflow
“Real” content and “artifacts” aren’t distinguished Consuming software can choose to utilize or ignore artifacts
Content copying and extraction is unreliable Content may be extracted with confidence
Not eligible for PDF/A conformance level A May conform with PDF/A conformance level A
Cannot comply with WCAG 2.0 or Section 508 May comply with WCAG 2.0, Section 508 and other accessibility regulations
Inaccessible to disabled users Accessible to those with PDF-aware Assistive Technology

Tags: Section 508, WCAG 2.0, assistive technology, mobile, tags
Categories: PDF, PDF/UA