Tagged PDF files contain
metadata which describe the document structure and the order of the different
document elements (e.g. pictures, text blocks, columns, titles). This
makes it easier to extract text or graphics from PDF files, and helps
screen readers to present the file content in the correct order. Accessibility
standards may require PDF files to be tagged.
The tag structure of a PDF document is accessible
in the Navigation panel of PDF Converter Professional. Open this tree
view from the Navigation panel's drop-down list or from under the View menu. When navigating through
the tree to verify if the order and hierarchy of the tags is appropriate,
you can optionally have associated content nodes highlighted.
The tag menu (structure display and tag-associated
operations) is accessible either by right-clicking a tree node or by using
the Options menu at the top of
the panel.
Tag menu
and commands
Tagging-related commands include:
Tag PDF (accessible from
the Tools menu) -
performs layout analysis on the open PDF and identifies tags along with
their related content.
The Tags panel
provides access to the Tag PDF Tool
and the Options menu.
Click the Tag PDF Tool and choose
from the following options:
Tag
PDF - see above.
Tag
annotations - if this option is marked, the annotations of
the PDF will also be tagged.
Tag
form fields only (accessible only when Tag
annotations is selected) - use it to include only form fields
in the tag tree, but no annotations of any kind.
The Options
menu offers the following commands:
New
tag - creates a new tag at the current tag hierarchy position.
Cut
- cuts the selected tag.
Paste
- pastes the cut tag after the selected tag node.
Paste
Child - pastes the cut tag under the selected tag.
Delete
tag - removes the selected tag.
Create
tag from selection (only available after you have selected
some PDF element with the TouchUp
Text or TouchUp
Object tools) - adds the chosen content to the selected tag.
Find
- searches for all document elements such as Artifacts, Unmarked
Comments, Unmarked Links, Unmarked Annotations, Unmarked Content that
are not associated with any tag. You can search the current page or
the entire document. Use it for manual tagging or verifying an existing
tag structure by stepping through the located elements one by one.
Properties
- displays the TouchUp Properties
dialog box. When you use it on a tag, it lets you edit the tag, attribute
objects and classes. Using it on assigned content additionally lets
you edit the container tag type and properties, or text attributes.
It lets you view or change alternate texts or expansion texts for
tagged objects. Alternate texts are used by screen readers to announce
and describe graphic objects on the page.
Create tags
root (only available for untagged PDFs) - creates the root object
of the tag tree. This is the only menu item in the drop-down list under
Options menu (at the top of the
Tags panel) for a non-tagged PDF.
Alternatively, right-click 'No tags available' and click this command.
Use it to start building up a tag structure manually. Once the root is
created, other commands become available in the drop-down menu.
Non-tagged
PDF Documents
Some PDF files may not have a tag structure.
In such cases, the Tags panel
shows an empty tree with the description "No tags available".
To create tags, you can either choose to add them to your document manually
or to use the in-built layout analyzer.
To run the layout analyzer choose Tag
PDF from the Tools menu
- see above.
When layout analysis is complete, located tags
- with reference to their contents - are added to the tree. You can review
and modify it, or add missed non-textual elements (this latter operation
has to be done manually). Once the PDF is tagged, the tag menu is available
- see above.
Note
Editing the content of a tagged PDF file, or deleting,
inserting pages, damages the tag structure. Therefore if necessary, use
the Tag PDF Tool that deletes
the existing tag structure and creates a new one.
