PDF/UA
E170443
PDF/UA is an ISO-standardized version of the PDF format specifically designed to ensure documents are accessible to users with disabilities and compatible with assistive technologies.
All labels observed (1)
| Label | Occurrences |
|---|---|
| PDF/UA canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T1500117 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: PDF/UA Context triple: [Portable Document Format, hasSubset, PDF/UA]
-
A.
Portable Document Format
Portable Document Format (PDF) is a widely used file format designed for reliably presenting and exchanging documents independent of software, hardware, or operating systems.
-
B.
Adobe Acrobat
Adobe Acrobat is a widely used software application for creating, viewing, editing, and managing PDF (Portable Document Format) documents across multiple platforms.
-
C.
PostScript
PostScript is a page description and programming language widely used in desktop publishing and printing to precisely define the layout and appearance of text and graphics.
-
D.
Authoring Tool Accessibility Guidelines
Authoring Tool Accessibility Guidelines are W3C recommendations that define how software used to create web content should support accessibility both in their user interfaces and in the content they produce.
-
E.
CSS Paged Media Module
The CSS Paged Media Module is a W3C specification that defines how CSS is used to control the layout and formatting of documents when they are printed or presented in paged media.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: PDF/UA Target entity description: PDF/UA is an ISO-standardized version of the PDF format specifically designed to ensure documents are accessible to users with disabilities and compatible with assistive technologies.
-
A.
Portable Document Format
Portable Document Format (PDF) is a widely used file format designed for reliably presenting and exchanging documents independent of software, hardware, or operating systems.
-
B.
Adobe Acrobat
Adobe Acrobat is a widely used software application for creating, viewing, editing, and managing PDF (Portable Document Format) documents across multiple platforms.
-
C.
PostScript
PostScript is a page description and programming language widely used in desktop publishing and printing to precisely define the layout and appearance of text and graphics.
-
D.
Authoring Tool Accessibility Guidelines
Authoring Tool Accessibility Guidelines are W3C recommendations that define how software used to create web content should support accessibility both in their user interfaces and in the content they produce.
-
E.
CSS Paged Media Module
The CSS Paged Media Module is a W3C specification that defines how CSS is used to control the layout and formatting of documents when they are printed or presented in paged media.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
ISO standard
ⓘ
accessibility standard ⓘ file format standard ⓘ |
| appliesTo | Portable Document Format ⓘ |
| definesRequirementsFor |
annotations accessibility
ⓘ
artifact content marking ⓘ bookmarks and outlines ⓘ color-independent information conveyance ⓘ document metadata ⓘ document navigation mechanisms ⓘ form field accessibility ⓘ headings and lists structure ⓘ keyboard accessibility of interactive elements ⓘ link and reference tagging ⓘ logical document structure ⓘ page content order ⓘ reading order in PDF ⓘ security settings compatible with accessibility ⓘ semantic structure in PDF ⓘ table structure and headers ⓘ tagged PDF structure ⓘ text alternatives for non-text content ⓘ use of Unicode in text ⓘ use of fonts and text encoding ⓘ use of language attributes ⓘ use of standard PDF tags ⓘ |
| ensures |
accessibility for users with disabilities
ⓘ
compatibility with assistive technologies ⓘ |
| focusesOn | accessible PDF documents ⓘ |
| fullName | PDF Universal Accessibility ⓘ |
| goal |
enable reliable use of assistive technology with PDF
ⓘ
provide consistent user experience for disabled users ⓘ standardize accessible PDF practices ⓘ |
| governingBody | International Organization for Standardization ⓘ |
| partOfSeries |
ISO 14289-1
ⓘ
linked to:
ISO 14289
|
| relatedTo |
PDF/A
ⓘ
PDF/X ⓘ Section 508 ⓘ WCAG ⓘ |
| requires |
accessible forms and interactive elements
ⓘ
alternative text for images and graphics ⓘ machine-readable structure information ⓘ proper tagging of all meaningful content ⓘ |
| standardNumber | ISO 14289 ⓘ |
| usedBy |
PDF authoring tools
ⓘ
PDF validation tools ⓘ enterprises producing accessible documents ⓘ government organizations ⓘ public sector document publishers ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: PDF/UA Description of subject: PDF/UA is an ISO-standardized version of the PDF format specifically designed to ensure documents are accessible to users with disabilities and compatible with assistive technologies.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.