Operation to make a document accessible.
Accessible or Tagged PDFs are the same as normal PDFs but have
been annotated with metadata in the form of PDF tags. This metadata
is required because PDF documents contain good layout information
but little semantic structure. The tags that are required supply
this semantic structure. The way they are inserted and operate is
defined in the Adobe PDF Specification.
See the MakeAccessible function for
further information on accessibility standards and tagged PDF.