tours
A chapter tour rag <tour> defines order in which reader will jump ahead to the next indicated chapter from any given chapter. Microsoft Reader requires x-metadata reference "ms-chaptertour" to a chapter tour declared in tours section as shown:

<metadata>
 <x-metadata>
  <meta name="ms-chaptertour" content="AllChapTour" />
 </x-metadata>
</metadata>

Note: Tours are supported in Microsoft Reader version 1.5.

A publisher can use the chapter tour declaration to connect a series of book sections: chapters, illustrations, parts, poems, volumes. The tour also need not be linear; it can jump forward and backward in a book. Each eBook is allowed one tour.

Sample:
<tours>
 <tour id="AllChapTour" title="All chapters">
  <site title="Chapter One" href="book.htm#ch1" />
  <site title="Chapter Two" href="book.htm#ch2" />
 </tour>
</tours>

attributes

id
Provides an element with a unique name within a single document. This is especially useful in works with extensive cross-referencing and linking, such as dictionaries, encyclopedias, or travel guides. Use of ids  simplifies linking and updates.
class
Affiliates an element with one or more classes.
style
Attaches a list of inline (name:value paired) CSS properties to a specific tag, for example: style="name:value;name:value"
Note: Media types other than "text/x-oeb1-css" will be ignored with a warning in a document of type "text/x-oeb1-document".

See also:

<x-metadata>, <guide>, <tour>, <site>