Adobe 22020737 Acrobat X Pro Manual - Page 277

About tags, accessibility, reading order, and reflow, Document language

Page 277 highlights

USING ACROBAT X PRO 271 Accessibility, tags, and reflow Document language Specifying the document language in a PDF enables some screen readers to switch to the appropriate language. Security that doesn't interfere with assistive software Some PDF authors restrict users from printing, copying, extracting, adding comments, or editing text. The text of an accessible PDF must be available to a screen reader. You can use Acrobat to ensure that security settings don't interfere with the screen reader's ability to convert onscreen text to speech. For more information about PDF accessibility, see www.webaim.org/techniques/acrobat/. More Help topics "Recognize text in scanned documents" on page 50 "Check and correct reading order" on page 289 "Workflow for creating accessible PDF forms" on page 285 "Add alternate text and supplementary information to tags" on page 299 "Set the document language" on page 295 "Prevent security settings from interfering with screen readers" on page 295 "Check accessibility with Full Check" on page 273 "Keys for accessibility" on page 490 About tags, accessibility, reading order, and reflow PDF tags are similar in many ways to XML tags. PDF tags indicate document structure: which text is a heading, which content makes up a section, which text is a bookmark, and so on. A logical structure tree of tags represents the organizational structure of the document. Therefore, tags indicate the reading order and improve navigation, particularly for long, complex documents without changing the PDF appearance. Assistive software determines how to present and interpret the content of the document by using the logical structure tree. Most assistive software depends on document structure tags to determine the appropriate reading order of text. Document structure tags let assistive software convey the meaning of images and other content in an alternate format, such as sound. An untagged document does not have structure information, and Acrobat must infer a structure based on the Reading Order preference setting. This situation often results in page items being read in the wrong order or not at all. Reflowing a document for viewing on the small screen of a mobile device relies on these same document structure tags. Often, Acrobat tags PDFs when you create them. To determine whether a PDF contains tags, choose File > Properties, and look at the Tagged PDF value in the Advanced pane of the Description tab. The logical structure tree appears on the Tags tab and shows document content as page elements nested at various levels. More Help topics "Reading PDFs with reflow and accessibility features" on page 275 "Accessibility preferences" on page 275 "Creating accessible PDFs" on page 281 Last updated 10/11/2011

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271
USING ACROBAT X PRO
Accessibility, tags, and reflow
Last updated 10/11/2011
Document language
Specifying the document language in a PDF enables some screen readers to switch to the appropriate language.
Security that doesn’t interfere with assistive software
Some PDF authors restrict users from printing, copying, extracting, adding comments, or editing text. The text of an
accessible PDF must be available to a screen reader. You can use Acrobat to ensure that security settings don’t interfere
with the screen reader’s ability to convert onscreen text to speech.
For more information about PDF accessibility, see
www.webaim.org/techniques/acrobat/
.
More Help topics
Recognize text in scanned documents
” on page
50
Check and correct reading order
” on page
289
Workflow for creating accessible PDF forms
” on page
285
Add alternate text and supplementary information to tags
” on page
299
Set the document language
” on page
295
Prevent security settings from interfering with screen readers
” on page
295
Check accessibility with Full Check
” on page
273
Keys for accessibility
” on page
490
About tags, accessibility, reading order, and reflow
PDF tags are similar in many ways to XML tags. PDF tags indicate document structure: which text is a heading, which
content makes up a section, which text is a bookmark, and so on. A logical structure tree of tags represents the
organizational structure of the document. Therefore, tags indicate the reading order and improve navigation,
particularly for long, complex documents without changing the PDF appearance.
Assistive software determines how to present and interpret the content of the document by using the logical structure
tree. Most assistive software depends on document structure tags to determine the appropriate reading order of text.
Document structure tags let assistive software convey the meaning of images and other content in an alternate format,
such as sound. An untagged document does not have structure information, and Acrobat must infer a structure based
on the Reading Order preference setting. This situation often results in page items being read in the wrong order or
not at all.
Reflowing a document for viewing on the small screen of a mobile device relies on these same document structure tags.
Often, Acrobat tags PDFs when you create them. To determine whether a PDF contains tags, choose File > Properties,
and look at the Tagged PDF value in the Advanced pane of the Description tab.
The logical structure tree appears on the Tags tab and shows document content as page elements nested at various
levels.
More Help topics
Reading PDFs with reflow and accessibility features
” on page
275
Accessibility preferences
” on page
275
Creating accessible PDFs
” on page
281