晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/share/doc/libidn/FAQ
Libidn FAQ -- Anticipated Frequently Asked Questions.
Copyright (C) 2002-2016 Simon Josefsson
See the end for copying conditions.

Q#1: Why doesn't Libidn use a separate library for the Unicode
     operations?

A#1: Separate libraries (Glib, QT, libiconv) seldom mark the
     Unicode tables with the corresponding Unicode version they
     implement, nor do they provide a interface where a specific
     version can be requested.  This violates the stringprep
     specification which requires that a specific version must be
     used.  Also, some of these third party libraries depend on
     non-portable behavior (e.g. threads).

Q#2: Why do Libidn include several stringprep profiles?  They waste
     space!

A#2: The stringprep profiles included are usually derived from the
     generic stringprep tables, and doesn't waste more than say a few
     hundred bytes (see profiles.c).  The Unicode normalization tables
     and the generic stringprep tables are roughly equivalent in size,
     although the latter tables can surely be compressed much further.
     They occupy about 100 kilobytes on typical platforms.  However,
     if in the future several large Stringprep profiles are added,
     configure options will be added to help reduce size.

Q#3: I thought GNU was encouraging libraries to be licensed under the GPL?

A#3: The reasoning for this was for libraries that provide unique
     functionality to encourage more free programs.  Since there are
     several IDN libraries out there, using the GPL for Libidn would
     only encourage people not to use Libidn which would not help the
     spread of free software.

Q#4: How do I add a new stringprep profile?

A#4: Add the profile definition to profiles.c, export the symbol and
     optionally add a CPP macro in stringprep.h (and document it in
     stringprep.c).  If you want to add self tests, do it through
     tst_stringprep.c.  Mention it in NEWS.

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