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Lamina PDF

link-without-structure

All codes

  • Type: error
  • Kind: usage (the caller misused the API)

What happened

Under PDF/UA-1, a link annotation has no Link structure element. The builder gives every link one automatically, except a link drawn inside an artifact, which stays outside the structure.

Why

A screen reader finds links through the structure tree, so a link inside decoration can’t be reached. The PDF/UA-1 standard for accessible PDF (ISO 14289-1 §7.18.5) requires each link annotation to be nested in a Link element. This is condition 28-011 of the Matterhorn Protocol, the PDF Association’s checklist of PDF/UA failures.

How to fix

Draw the link outside Surface::artifact, next to the text it belongs to; the builder then wraps it in a Link element.

Example

surface.artifact(ArtifactKind::Layout, |s| {
    s.link(rect, LinkTarget::Uri("https://example.com".into()), Some("Example".into()));
    Ok(())
})?;
builder.finish()?; // link-without-structure

Data fields

  • page: the page’s index (0-based).
  • count: how many links on that page lack a Link element.