Try the following: \documentclass{article} \usepackage{xltxtra} \setmainfont[Mapping=tex-text,Numbers=OldStyle,Ligatures={Required,Common,Rare}]{Junicode}
\begin{document} Fifty afflicted fjords. \end{document} Load the PDF, and search for any of the words. The "fty", "ct" and "fj" ligatures aren't in Unicode, and the private-use characters obviously can't be decomposed by the PDF viewer. The same problem will obviously occur for variant letter shapes, old-style digits, etc. But scanned documents in PDF often have an invisible text layer attached which can be searched, etc.; is it possible to use the same technique to put the decomposed letters over the visible private-use characters, so that documents remain searchable (and copy/paste-able)?
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