[XeLaTeX] warning fontspec Style=Italic

Salve a tutti,
ho da poco scoperto XeLaTeX che mi è davvero utilie perché volevo usare i miei font, ma ottengo degli Warning che non riesco a capire.

Anzitutto quando uso un font che ha il corsivo (Tipo l’Adobe Jenson Pro, o anche Linux Libertine) l’opzione Style=Italic dice che non è supportata, mentre \itshape funziona (che differenza c’è tra i due?). Poi ci sono diversi warning su shape non supportate o non definite, infine c’è continuamente un warning sull’uso di OldStyleNumbers ridefinito che mi infastidisce assai.
C’è modo di sistemare? Ringrazio anticipatamente.
Sistema: MikteX 2.9, Windows 7, TeXniCenter 2 Alpha

Log:
`This is XeTeX, Version 3.1415926-2.3-0.9997.5 (MiKTeX 2.9) (preloaded format=xelatex 2012.9.8) 14 SEP 2012 09:44
entering extended mode
**LaTeX1.tex
(“C:\Users\Cam\Documents\Libretto Matrimonio\test\LaTeX1.tex”
LaTeX2e <2011/06/27>
Babel and hyphenation patterns for english, afrikaans, ancientgreek, arabic, armenian, assamese, basque, bengali
, bokmal, bulgarian, catalan, coptic, croatian, czech, danish, dutch, esperanto, estonian, farsi, finnish, french, galic
ian, german, german-x-2009-06-19, greek, gujarati, hindi, hungarian, icelandic, indonesian, interlingua, irish, italian,
kannada, kurmanji, lao, latin, latvian, lithuanian, malayalam, marathi, mongolian, mongolianlmc, monogreek, ngerman, ng
erman-x-2009-06-19, nynorsk, oriya, panjabi, pinyin, polish, portuguese, romanian, russian, sanskrit, serbian, slovak, s
lovenian, spanish, swedish, swissgerman, tamil, telugu, turkish, turkmen, ukenglish, ukrainian, uppersorbian, usenglishm
ax, welsh, loaded.
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LaTeX Font Info: Overwriting symbol font `largesymbols' in version `normal'
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Variant \tl_gset:cV already defined; not changing it on line 66

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Package: fontenc 2005/09/27 v1.99g Standard LaTeX package

(“C:\Program Files (x86)\MiKTeX 2.9\tex\latex\euenc\eu1enc.def”
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LaTeX Font Info: Try loading font information for EU1+lmr on input line 100.

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File: xunicode.sty 2011/09/09 v0.981 provides access to latin accents and many other characters in Unicode lower plane

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LaTeX Font Info: Encoding `OT1' has changed to `EU1' for symbol font
(Font) `operators' in the math version `normal' on input line 4.
LaTeX Font Info: Overwriting symbol font `operators' in version `normal'
(Font) OT1/cmr/m/n –> EU1/LinuxLibertine(0)/m/n on input line 4.
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*************************************************
* fontspec warning: “icu-feature-not-exist-in-font”
*
* OpenType feature 'Style=Italic' (+ital) not available for font 'Linux
* Libertine' with script 'Latin' and language 'Default'.
*************************************************
………………………………………….
. fontspec info: “defining-font”
.
. Font family 'LinuxLibertine(0)' created for font 'Linux Libertine' with
. options [,Style=Italic].
.
. This font family consists of the following shapes:
………………………………………….

LaTeX Font Warning: Font shape `EU1/LinuxLibertine(0)/m/sl' undefined
(Font) using `EU1/LinuxLibertine(0)/m/n' instead on input line 16.

[1

] (“C:\Users\Cam\Documents\Libretto Matrimonio\test\LaTeX1.aux”)

LaTeX Font Warning: Some font shapes were not available, defaults substituted.

)
Here is how much of TeX's memory you used:
13239 strings out of 429156
291156 string characters out of 3167930
284963 words of memory out of 3000000
16412 multiletter control sequences out of 15000+200000
4409 words of font info for 31 fonts, out of 3000000 for 9000
786 hyphenation exceptions out of 8191
44i,5n,42p,583b,158s stack positions out of 5000i,500n,10000p,200000b,50000s

Output written on LaTeX1.pdf (1 page).
`

Esempio:
`\documentclass[9pt,twoside]{extbook}
\usepackage{fontspec}
\setmainfont{Linux Libertine}
\begin{document}
\itshape
\addfontfeature{Style=Italic}
The quick brown fox jumps over the lazy dog.

\textbf{The quick brown fox jumps over the lazy dog.}

\emph{The quick brown fox jumps over the lazy dog.}

Affine.

Affluente.
\end{document}`