This document specifies how to use the Portable Document Format (PDF) specified in ISO 32000-2 to construct accessible digital documents using PDF technology. This document does not specify: —    processes for converting paper or electronic documents to the PDF/UA format; —    technical design, user interface, implementation, or operational details of presentation; —    physical methods of storing these documents such as media and storage conditions; —    required computer hardware and/or operating systems; —    requirements specific to content (beyond facilitating programmatic access and textual representation); —    requirements applying to specific classes (e.g. invoices, reports, etc.) of documents.