ISO 19005-2:2011 (PDF/A-2) - Overview
ISO 19005-2:2011 specifies PDF/A-2, the PDF‑based file format for long‑term preservation of page‑oriented electronic documents. Built on PDF 1.7 (ISO 32000-1), PDF/A-2 constrains PDF features so documents retain their static visual representation over time while supporting improved capabilities (e.g., compressed object streams, transparency, JPEG 2000). The standard focuses on file format rules, conformance levels and technical requirements - not on conversion workflows, storage media, rendering UI or hardware.
Key topics and technical requirements
- Conformance levels: Level A (full conformance including structure and semantic properties), Level B (visual appearance), Level U (visual + Unicode text).
- File structure: Mandatory elements and restrictions to ensure stable, self-contained files (cross‑reference handling, compressed object/XRef streams).
- Graphics and imaging: Support and constraints for transparency, color management (ICC profiles), JPEG 2000 compression, and graphic operators.
- Fonts: Requirements for embedded, identifiable fonts to preserve visual fidelity.
- Annotations & forms: Rules for annotations and interactive forms (restrictions to maintain static rendering).
- Metadata & logical structure: Use of XMP/RDF for descriptive and preservation metadata; tagged PDF improvements for accessibility and semantic structure.
- Embedded files & optional content: Policies for attachments and optional content (layers/OCG) to remain conformant.
- Security & signatures: Annexed requirements for inclusion of digital signatures in PDF/A files.
- Validation & conformance: Requirements for conforming readers and validation criteria to verify files meet the chosen conformance level.
Practical applications
- Long‑term archival and records management (government, legal, corporate archives) where visual fidelity and searchable text must persist across technology changes.
- Digital libraries, museums and cultural heritage repositories preserving manuscripts, reports and publications.
- Compliance and regulatory retention programs that require standardized, verifiable file formats.
- Publishing and print workflows requiring archival‑grade PDFs with advanced imaging (JPEG 2000, transparency).
- Software vendors building PDF creation, rendering and validation tools that support PDF/A conformance.
Who uses this standard
- Records managers, archivists and librarians implementing digital preservation policies.
- IT architects designing archive systems and workflows.
- Software developers and vendors (PDF creation, validation, rendering).
- Legal, healthcare and government organizations with long‑term retention obligations.
Related standards
Keywords: ISO 19005-2, PDF/A-2, PDF 1.7, long-term preservation, document management, PDF/A, digital preservation, archival PDF, metadata, tagged PDF.
Open preview (PDF)Document management — Electronic document file format for long-term preservation — Part 2: Use of ISO 32000-1 (PDF/A-2)
