Module pdfua 

PDF/UA-1 conformance validation (ISO 14289-1).

A rule engine over the parsed document, mirroring crate::pdfa: each check inspects one aspect and yields zero or more Violations. This covers the high-signal, machine-checkable clauses of PDF/UA-1 (the “Universal Accessibility” conformance):

• the document is tagged (/MarkInfo /Marked true)
• a /StructTreeRoot is present and non-empty
• the catalog declares a /Lang (BCP 47)
• every /Figure structure element carries /Alt or /ActualText
• the structure tree contains at least one heading (H / H1…H6)
• every structure role is a standard type or mapped onto one via /RoleMap (no unresolved Other roles)
• every page carries /StructParents

Everything is best-effort and read-only over ParseLimits-bounded APIs. Annotation /OBJR coverage and table-structure consistency are out of scope (first version).

Structs

ValidationReport

The outcome of a validation run.

Violation

One conformance violation.

Enums

Profile

The validation profile.

Functions

validate

Validate file against PDF/UA-1.