Adobe InDesign CS3 Bedienungsanleitung PDF herunterladen (Seite 497)

INDESIGN CS3

User Guide

490

When you apply tags to a document for PDF export, the tags do not control which content is exported to PDF, as is

the case with XML export. Instead, the tags give Acrobat more information about the document’s structural contents.

Advantages of using tags

By applying tags to your document before exporting to PDF, you can do the following:

• Map InDesign paragraph style names to Acrobat tagged Adobe PDF paragraph styles to create a reflowable PDF

file for viewing on handheld devices and other media.

• Mark and hide printing artifacts, text, and images so that they won’t appear when reflowed in Acrobat. For

example,ifyoutagapageitemasArtifact,thepageitemwillnotbedisplayedwhenyoureflowthecontentsofa

tagged Adobe PDF document on a handheld device, a small display, or a monitor at a large magnification.

• Add alternative text to figures so that the text can be read aloud to the visually impaired with screen-reading

software.

• Replace graphic letters, such as ornate drop-caps, with readable letters.

• Provide a title for a set of articles, or group stories and figures into articles.

• Order stories and figures to establish a reading order.

• Recognize tables, formatted lists, and tables of contents. Recognize which content blocks belong to the different

stories.

• Include text formatting information such as Unicode values of characters, spacing between words, and the recog-

nition of soft and hard hyphens.

See also

“Structure pane overview” on page 530

“Tag items” on page 525

How tags affect reuse and accessibility

The content of a Adobe PDF document can be reused for other purposes. For example, you might create an Adobe

PDF file of a report with text, tables, and images, and then use various formats to distribute it: for printing or reading

on a full-sized monitor, for viewing on a handheld device, for reading out loud by a screen reader, and for direct

access through a web browser as HTML pages. The ease and reliability with which you can reuse the content depends

on the underlying logical structure of the document.

To make sure that your Adobe PDF documents can be reused and accessed reliably, you must add tags to them.

Tagging adds an underlying organizational structure, or logical structure tree,tothedocument.Thelogicalstructure

tree refers to the organization of the document’s content, such as title page, chapters, sections, and subsection. It can

indicate the precise reading order and improve navigation—particularly for longer, more complex documents—

without changing the appearance of the PDF document.

Forpeoplewhoarenotabletoseeordecodethevisualappearanceofdocuments,assistivetechnologycanaccessthe

content of the document reliably by using the logical structure tree. Most assistive technology depends on this

structure to convey the meaning of content and images in an alternative format, such as sound. In an untagged

document, no such structure exists, and Acrobat must infer a structure, based on the reading order choices in the

preferences. This method is unreliable and often results in page items read in the wrong order or not read at all.

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Adobe InDesign CS3 Bedienungsanleitung Seite 497

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