Adobe Acrobat 7.0.5, Manual

Page: 53 / 122

Acrobat SDK User’s Guide
53
Working with PDF Documents
Using Document Logical Structure
5
Using Document Logical Structure
As discussed in “Creating Tagged PDF Documents” on page 43 , you can insert logical
structure into a PDF document by creating a tagged PDF document.
The PDSEdit API provides the ability to add, modify and view this logical structure. For
more information, see the Acrobat and PDF Library API Overview .
Navigating a PDF Document
PDSEdit methods allow you to navigate through a document according to its structure.
Bookmarks made from structure can go to an individual paragraph or a whole section,
rather than just to a point on a page.
PDSEdit also allows searching within structure
elements. For example, you can search for a word within elements of a certain type, such as
headings. It can be used to move around a document, to analyze its content, and to
traverse its hierarchical structure.
Extracting Data From a PDF Document
The PDSEdit API allows you to extract portions of pages according to their context, such
as all of the headings or tables. The extracted data can be used in different ways, such as
summarizing document information, importing the data into another document, or
creating a new PDF document.
Adding Structure Data to a PDF Document
Authoring applications create documents that can be converted to PDF. When the
document is converted to PDF and viewed, Acrobat does not automatically add structure
to the document. You can add structural information to any PDF file with the
PDSEdit API.
Once a file has logical structure, you can use
PDSEdit
to access and modify that structure.
Using pdfmark to Add Structure Data to PDF
Authoring applications may add structure pdfmarks to the PostScript language code
generated when a document is printed. When the Acrobat Distiller application creates a
PDF file from such PostScript code, it generates structure information in the PDF file from
the
pdfmarks . This approach requires that either the authoring application to add structure
pdfmarks to the PostScript code it generates, or that some other application generates the
pdfmarks . See “Adding Structure Data to a PDF Document” on page 44 and the pdfmark
Reference for more information.