Missing structural elements
All elements in a PDF should be tagged, except when an element is explicitly marked as an artifact.
Detailed explanation
The AI-assisted check has detected an element in the document, such as a paragraph or an image; however, this region is not tagged in the document. PAC flags the missing structural element with an error or a warning.
| Cases | Result |
|---|---|
| The AI-assisted check detects a region that is not tagged in the document (probability ≥ 80%). | ERROR |
| The AI-assisted check detects a region that is not tagged in the document (probability ≥ 50% and < 80%). | WARNING |
| The AI-assisted check detects a region, and a tag exists at that position in the document. | PASSED |
| The AI-assisted check detects a region that is not tagged in the document (probability < 50%). | SKIPPED |