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In the .otf fonts where they are present, the Contextual Alternate (calt) and Localized Forms (locl) functions work fine in LibreOffice.

Experiment: I create a quoteright.fr glyph with a large bearing and impose a calt because quoteright glyph in Italian and in French is replaced by quoteright.fr glyph.

With LibreOffice the difference is evident: for the first line I set the Italian language, for the second line the English language (without bearing):

Instead with Xetex I can not enable these functions.

If I do not specify anything in the font features, the contextual substitution rule does not work.

If I enter Contextuals = Alternate I receive the message:

Package fontspec Warning: OpenType feature 'Contextuals = Alternate' (calt) not

(fontspec) available for font 'GaramondPremPro' with script

(fontspec) 'Latin' and language 'Default'.

and again the contextual replacement rule does not work.

Here is Xetex (first line in Italian, second in English

with the following code:

documentclass {article}

usepackage{fontspec}

setmainfont[Ligatures=TeX,Numbers=OldStyle]{Garamond Premier Pro}

usepackage{polyglossia}

setmainlanguage[babelshorthands=true]{italian}

setotherlanguages{english}



begin{document}



I'I N'P



begin{english}I'I N'Pend{english}

end {document}

What can you depend on? Is there an error or a lack in my code?

Thank you

PS

otfinfo -f recognizes only system-wide features, and not localized ones (neither calt nor locl), that are also present in the font if I check it with FontLab or FontForge:

samiel@darkstar:~/work$ otfinfo --features font.otf

aalt    Access All Alternates

c2sc    Small Capitals From Capitals

cpsp    Capital Spacing

dnom    Denominators

frac    Fractions

kern    Kerning

liga    Standard Ligatures

lnum    Lining Figures

numr    Numerators

onum    Oldstyle Figures

pnum    Proportional Figures

smcp    Small Capitals

sups    Superscript

tnum    Tabular Figures

zero    Slashed Zero

PS2

I tried various possibilities. The following one:

documentclass{article}

usepackage{fontspec}

setmainfont[Ligatures=TeX,Numbers=OldStyle,Language=Italian,RawFeature={+calt}]{Garamond Premier Pro}

usepackage{polyglossia}

%setmainlanguage[babelshorthands=true]{italian}

setotherlanguages{english}



begin{document}



I'I N'P



begin{english}I'I N'Pend{english}



end{document}

produces the calt all over the document, not only for Italian and French languages (as in the font localized calt rule).

If I set

setmainfont[Ligatures=TeX,Numbers=OldStyle,RawFeature={+calt}]{Garamond Premier Pro}

usepackage{polyglossia}

setmainlanguage[babelshorthands=true]{italian}

the replacement is never produced

Added answer to wrong question:

I tried various possibilities. The following one:

documentclass{article}

usepackage{fontspec}

setmainfont[Ligatures=TeX,Numbers=OldStyle,Language=Italian,RawFeature={+calt}]{Garamond Premier Pro}

usepackage{polyglossia}

%setmainlanguage[babelshorthands=true]{italian}

setotherlanguages{english}



begin{document}



I'I N'P



begin{english}I'I N'Pend{english}



end{document}

produces the calt all over the document, not only for Italian and Frenc (as inthe font cal rule.

If I set

setmainfont[Ligatures=TeX,Numbers=OldStyle,RawFeature={+calt}]{Garamond Premier Pro}

usepackage{polyglossia}

setmainlanguage[babelshorthands=true]{italian}

the replacement is never produced

The font in your comment works fine for me:

documentclass{article}

usepackage{fontspec}

setmainfont[Language=Italian]{SamielPro.otf}

setsansfont{SamielPro.otf}



begin{document}



I'I N'P



sffamily 

I'I N'P





end{document}

With lualatex it doesn't work, there one need to add the calc-feature explicitly:

setmainfont[Language=Italian,RawFeature=+calt]{SamielPro.otf}

A language depending call could be setup with babel and babelfont:

documentclass{article}

usepackage{fontspec}

usepackage[english,italian]{babel}

babelfont{rm}[Ligatures=TeX]{SamielPro.otf}



% for luatex:

%babelfont[italian]{rm}[RawFeature=+calt,Ligatures=TeX]{SamielPro.otf}



begin{document}



I'I N'P



selectlanguage{english}

I'I N'P



end{document}