PDF Association logo

Discover pdfa.org

Key resources

Get involved

How do you find the right PDF technology vendor?
Use the Solution Agent to ask the entire PDF communuity!
The PDF Association celebrates its members’ public statements
of support
for ISO-standardized PDF technology.

Member Area


Technical Note 0001 – PDF/A-1 and Namespaces

A PDF/A-1 file must be identified as such by the presence of a certain entry in its XMP document metadata. In order to be able to retrieve this entry reliably, it is essential that all syntactical requirements for storing metadata are followed precisely. In early implementations of PDF/A tools this was not always the case due to several reasons.

Note:  The information provided in this TechNote has been published by ISO as PDF/A-1 Technical Corrigendum 1 (see [4]) in April 2007. However, this TechNote predates Technical Corrigendum 1 and we still provide it for consistency.


Download PDF

Originally published by the PDF/A Competence Center, now the PDF Association.

Freely available under a CC-BY 4.0 license.

PDF/A icon

Community: PDF/A TWG

ISO Group Responsible: ISO TC171 SC2 WG5

ISO Status: status of all PDF-related ISO work

Publications: PDF/A in a Nutshell 2.0, PDF/A Flyer

Test Suites: Isartor, veraPDF


WordPress Cookie Notice by Real Cookie Banner