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/usr/share/X11/locale/zh_TW.UTF-8/XLC_LOCALE is in libx11-data 2:1.6.3-1ubuntu2.

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#  XLocale Database Sample for zh_TW.UTF-8
# 

# 
# 	XLC_FONTSET category
# 
XLC_FONTSET

on_demand_loading	True

object_name		generic

#	We leave the legacy encodings in for the moment, because we don't
#	have that many ISO10646 fonts yet.
# 	fs0 class (7 bit ASCII)
fs0	{
	charset	{
		name	ISO8859-1:GL
	}
	font	{
		primary		ISO8859-1:GL
		vertical_rotate	all
	}
}
#	fs1 class (ISO8859 families)
fs1	{
	charset	{
		name	ISO8859-1:GR
	}
	font	{
		primary	ISO8859-1:GR
	}
}
# 	fs2 class (Chinese Han Character (Traditional))
fs2	{
        charset {
                name    BIG5-0:GLGR
        }
        font    {
                primary BIG5-0:GLGR
				substitute BIG5-0:GLGR
        }
}
#	fs3 class
fs3	{
	charset	{
		name	ISO10646-1
	}
	font	{
		primary	ISO10646-1
	}
}
END XLC_FONTSET

# 
# 	XLC_XLOCALE category
# 
XLC_XLOCALE

encoding_name		UTF-8
mb_cur_max		6
state_depend_encoding	False

#	cs0 class
cs0	{
	side		GL:Default
	length		1
	ct_encoding	ISO8859-1:GL
}

#	cs1 class
cs1     {
        side            GR:Default
        length          1
        ct_encoding     ISO8859-1:GR
}
 
#	cs2 class
cs2	{
	side		none
	length		2
	ct_encoding	BIG5-0:GLGR
}

#	cs3 class
cs3	{
	side		none
	ct_encoding	ISO10646-1
}

END XLC_XLOCALE