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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<preface id='About_This_Manual'>
<title>About This Manual</title>

<para>
X Toolkit Intrinsics — C Language Interface is intended to be read by both application programmers
who will use one or more of the many widget sets built with the Intrinsics and by widget
programmers who will use the Intrinsics to build widgets for one of the widget sets. Not all the
information in this manual, however, applies to both audiences. That is, because the application
programmer is likely to use only a number of the Intrinsics functions in writing an application and
because the widget programmer is likely to use many more, if not all, of the Intrinsics functions
in building a widget, an attempt has been made to highlight those areas of information that are
deemed to be of special interest for the application programmer. (It is assumed the widget programmer
will have to be familiar with all the information.) Therefore, all entries in the table of
contents that are printed in <emphasis role='strong'>bold</emphasis> indicate the information that
should be of special interest to an application programmer.
</para>
<para>
It is also assumed that, as application programmers become more familiar with the concepts discussed
in this manual, they will find it more convenient to implement portions of their applications
as special-purpose or custom widgets. It is possible, nonetheless, to use widgets without
knowing how to build them.
</para>

<bridgehead><emphasis role='strong'>Conventions Used in this Manual</emphasis></bridgehead>
<para>This document uses the following conventions:</para>
<itemizedlist spacing='compact'>
  <listitem>
    <para>
Global symbols are printed in <function>this special font</function>. These can be either
function names, symbols defined in include files, data types, or structure names. Arguments to
functions, procedures, or macros are printed in italics.
    </para>
  </listitem>
  <listitem>
    <para>
Each function is introduced by a general discussion that distinguishes it from other functions.
The function declaration itself follows, and each argument is specifically explained.
General discussion of the function, if any is required, follows the arguments.
    </para>
  </listitem>
  <listitem>
    <para>
To eliminate any ambiguity between those arguments that you pass and those that a function
returns to you, the explanations for all arguments that you pass start with the word
specifies or, in the case of multiple arguments, the word specify. The explanations for all
arguments that are returned to you start with the word <emphasis>returns</emphasis> or, in
the case of multiple arguments, the word <emphasis>return</emphasis>.
    </para>
  </listitem>
</itemizedlist>
</preface>

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