Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Table Recognition(also: Table Detection, Table Extraction)
- The automated process of detecting and reconstructing tabular data structures from document images, scanned PDFs, or other non-structured formats. Table recognition goes beyond basic OCR by identifying the spatial relationships between text elements — rows, columns, cells,…
- Table accessibility(also: Accessible tables, Data table accessibility)
- The practice of structuring data tables so they can be understood by assistive technology users. Accessible tables require proper markup that distinguishes header cells from data cells, establishes relationships between headers and the data they describe, provides captions or…
- Tag Tree(also: PDF Tag Structure, Structure Tree, Tagged PDF Structure)
- The hierarchical structure of semantic tags embedded within a PDF document that defines the logical organization and reading order of its content. A tag tree is analogous to the DOM (Document Object Model) in HTML — it identifies headings, paragraphs, lists, tables, figures, and…
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