Hello world!
Some pdf files has a built-in index that can be used for navigation, which
in most cases, are shown in the left side plate of the PDF browser, for
example `evince`. If still not clear, you may think of latex generated pdf
files (most of them has this structured index navigation).
*How to export the index structure used for nevigation as plain
text?*Implementing this index navigation feature into pdf browsers
like `evince`
clearly needs this as in important API.
Best
，
========================
He who is worthy to receive his days and nights is worthy to receive* all
else* from you (and me).
The Prophet, Gibran Kahlil
Gibran
