I know XeTeX can easily turn on and off Linux Libertine's different sets of ligatures as described in the Manual for Linux Libertine with XeTeX, but is there a way to use the discretionary or the historical ligatures with pdfTeX? Is this just the point where pdfTeX can't keep up with XeTeX anymore?
The three sets of ligatures (standard and the two before-mentioned) as well as some examples of each are listed on page 8 of Libertine's German documentation for XeTeX, but I'd also be interested in a full list of each.
As a reference: The pdfTeX package for Linux Libertine is called
libertine, it doesn't have a real documentation on CTAN, just a readme; another sort-of documentation doesn't mention any ligature-related feature. So I might be looking for a solution outside the range of the package? Is this possible with whatever font tables are installed with the package?