Arthur Reutenauer wrote:
can you explain in mode detail what you mean with 'actual text tags' ?

  He means "ActualText tags" :-)  See the PDF spec section 14.9.4, page 623.
It's a more generic way to support searching than ToUnicode vectors: you just
specify the actual string of underlying Unicode characters.  The PDF spec uses
hyphenated "ck" in German as an example: you typeset "Druk-ker" but you want to
search for "Drucker".  You can't do that with ToUnicode vectors.

  Anyway, this needs support at the engine level and I don't think there is;
actually it would be nice to add that to LuaTeX.

hm, if done with words it's probably doable with an unadapted engine (esp when we have a cleaner pdfliteral model, which is on the agenda)

\starttext
    \dorecurse{100}{test }
    \pdfliteral{/Span <</ActualText (hans) >> BDC}arthur\pdfliteral{EMC}
    \dorecurse{100}{test }
\stoptext

not that hard to implement if we add a span around each word

Hans

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