# [dev-context] two proposals for attachments in PDF/A-3

Hans Hagen j.hagen at xs4all.nl
Mon Mar 25 11:23:38 CET 2019

```On 3/24/2019 6:30 PM, Pablo Rodriguez wrote:
> Hans,
>
> I realized that the values for the /AFRelationship key that I provided
> in a previous message, are the ones defined for PDF-2.0 (Source, Data,
> Alternative, Supplement, EncryptedPayload, FormData, Schema or Unspecified).
>
> According to
> https://www.loc.gov/preservation/digital/formats/fdd/fdd000360.shtml,
> values for the /AFRelationShip key in PDF/A-3 are only: Source, Data,
> Alternative, Supplement, and Unspecified.
>
> If you allow me a suggestion, maybe it would be useful to have two new
> options in the \setupattachment command:
>
>    relationship  =  source data alternative supplement unspecified
>
>    association   =  document page
>
> The default values could be document and unspecified. The user should
> know what to do when changing these defaults.
>
> Of course, the /AF entry can be placed in other PDF objects, but