方法一

通过 :: 进行缩进，只对单行其作用。 

AsciiDoc::
    Converts AsciiDoc (`.txt`) files to DocBook XML (`.xml`) files.

形成的效果如下：

可以看出，converts相当于AsciiDoc形成了缩进。但是此时，:: 前的内容被加粗了，如果不想加粗，可以将 :: 单独放在一行，如下所示：

AsciiDoc

 ::
    Converts AsciiDoc (`.txt`) files to DocBook XML (`.xml`) files.

方法二

通过如下标记对来缩进

这一行顶格。
+
--

  这里的内容被缩进。

--

这种方式非常适合在有序或无序列表中对某个list下的内容进行缩进，示例如下：

. An optional document revision number followed by an optional
  revision date followed by an optional revision remark:
+
--
  * If the revision number is specified it must be followed by a
    comma.
  * The revision number must contain at least one numeric character.
  * Any non-numeric characters preceding the first numeric character
    will be dropped.
  * If a revision remark is specified it must be preceded by a colon.
    The revision remark extends from the colon up to the next blank
    line, attribute entry or comment and is subject to normal text
    substitutions.
  * If a revision number or remark has been set but the revision date
    has not been set then the revision date is set to the value of the
    'docdate' attribute.

Examples:

  v2.0, February 2003
  February 2003
  v2.0,
  v2.0, February 2003: Rewritten for version 2 release.
  February 2003: Rewritten for version 2 release.
  v2.0,: Rewritten for version 2 release.
  :Rewritten for version 2 release.
--

. The revision information line can also be an RCS/CVS/SVN $Id$
  marker:
+
--
  * AsciiDoc extracts the 'revnumber', 'revdate', and 'author'
    attributes from the $Id$ revision marker and displays them in the
    document header.
  * If an $Id$ revision marker is used the header author line can be
    omitted.

Example:

  $Id: mydoc.txt,v 1.5 2009/05/17 17:58:44 jbloggs Exp $
--