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Tagged PDF
and Text Reflow
in Acrobat 5
Thomas Merz
PDFlib GmbH
München, Germany
www.pdflib.com
PDF 2001 conference
Baltimore, June 2001
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Current Problems with Acrobat/PDF
>Text in PDF looks good, but can’t really be re-used:
–cut-and-paste to the clipboard
–search engines often have a hard time with PDF
–accessibility goals are hard or impossible to meet (screenreader programs)
–conversion of PDF text requires heuristics and is not completely reliable
>PDFs must be designed to look good on screen or print, but not both:
–looks good in print, but is hard to read on screen
–looks good on screen, but wastes paper when printed
–page layout can’t be adjusted to individual viewing conditions
>Most PDFs have no inherent structure in addition to pages
–no headings, sections, lists etc. – just text
–no distinction between main text and pagination artifacts possible
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I
Structure Information
in Acrobat/PDF
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Review: Logical Structure in Acrobat 4/PDF 1.3
>We need data about documents in addition to the actual documents:
–meta data = information about the document as a whole
–structure = information about portions of the document, and their 
relationships
>PDF 1.3 reaches the structure world:
–PDF document may contain structure information in addition to appearance 
information
–PDF as a container for information which is used later
–XML features are integrated in PDF, although not literally
>Currently only marginally used due to missing features in Acrobat 4
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Embedding Content Structure in PDF 1.3
>Basic problem: text in PDF is often heavily fragmented; how to address 
individual content portions?
>Identify contents in the document:
–attach text blocks to logical elements
–contrary to XML, not only text can be part of an element, but any kind of 
rendered content (marked content, XObjects)
>Content is organized in a structure tree:
–hierarchical system of logical elements
–each element points to some document content, or other elements
>Predefined standard elements for logical units (similar to HTML)
>Additional application-specific logical elements can be defined
>Content structure tree and page tree are completely separated, and refer to 
each other
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Structured Bookmarks
>Contrary to common bookmarks, structured bookmarks don’t point to a 
specific location in the document but to a specific structure element
>Structured bookmarks may be attached to a page range
>They »know« about the corresponding document sections
>Structured bookmarks play an important role in Web Capture
>Actions with structured bookmarks:
–delete, print, extract, append next level, view Web links
Generating structured PDF with Acrobat 4
>Acrobat Web Capture:
–translates structure information from HTML document to PDF structure
>PDFMaker for Microsoft Word:
–generates structured PDF from paragraph styles
>FrameMaker 6.0:
–generates structured PDF from paragraph styles
>Technical approaches:
–pdfmark operator: PostScript code contains structure information
–Acrobat’s plugin programming interface
–generate structured PDF directly
User Interface for structured PDF in Acrobat 5
>For the most part, structured PDF in Acrobat 4 is only a theoretical concept:
–not really supported by document creation software
–Acrobat 4 doesn’t offer much added value for structured PDF (except Web 
Capture and structured bookmarks)
–not much incentive for third-party developers to end the vicious circle
>Acrobat 5 finally adds a user interface for structure information in PDF:
–Tags palette: display the complete structure tree
–Create new or modify existing documents
–Can modify the structure tree with drag-and-drop
–Edit element properties
–»Associated Content Highlighting« visualizes the structure elements
II
Tagged PDF
in Acrobat 5
What is Tagged PDF?
>Tagged PDF extends Acrobat 4’s notion of structured PDF:
–includes a logical structure tree
–includes Unicode values for all text contents
–distinguishes important page contents from pagination artifacts
–knows the reading order of text elements
–may include alternative text for content elements
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