The Matterhorn Protocol establishes formal PDF/UA validation criteria

On August 4, 2013, the PDF Association issued the Matterhorn Protocol, establishing formal validation criteria for conformance with PDF/UA. The Matterhorn Protocol lists all the possible ways to fail the precise technical specifications provided in ISO standard 14289 (PDF Universal Accessibility):

  • 136 failure conditions
  • 89 can be determined by automated testing alone
  • Manual inspection and knowledgeable human judgment are essential for evaluating the remaining 47 conditions

The Matterhorn Protocol promotes adoption of PDF/UA by software developers and document remediators, bringing the substantial benefits of PDF/UA closer to reality.