Structure in textbook file makes it easier for screen readers and other assistive technologies to read and navigate a document. The following Accessibility Levels are provided by ATI based on quality of files provided by the publishers, individual scanned materials and individual accessibility needs.
NS: Not Structured
- Bookmarks
- Linked TOC
- Page numbers
AL1 – Accessibility Level 1
- Auto Tags
- OCR (Optical Character Recognition)
- Bookmarks
- Page Numbers
AL2 – Accessibility Level 2
- In addition to Level 1, AL2 documents include the following:
- Structured Headings
AL3 – Accessibility Level 3
- In addition to Level 1 and Level 2, AL3 documents include the following:
- Alternative text for all meaningful images
- Structured lists and tables
- Descriptions for complex images (as needed)
- Accessible Math (as needed)