# Description
PDF/A-3 requires a PDF version <= 1.7 and defines three conformance levels,
in the following order from less strict to more strict:
- Level B
- Level U
- Level A
It is exactly the same as PDF/A-2, except for clause 6.8.
See `README.md` for the meaning of each subclause.
## Level B
## 6.8 Embedded files
- krilla allows embedded files in this export mode. 🟢
// TODO: Decide whether UF should be written for < PDF 1.7.
- krilla writes `F` and `AFRelationship` for embedded files, and writes `UF` for PDF 1.7
exports. ðŸŸ
- krilla requires modification date, description and MIME subtype for embedded files in this
export mode. 🟢
- The fact that embedded file relationships should correctly describe the relationship to
the document is documented. 🟣
## Level U
-
# Level A
-