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+<?xml version="1.0" standalone="no"?>
+
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
+
+]>
+
+<section id="editor-window-timeline">
+  <title>Timeline</title>
+  <para>
+    At the top of the track display area is the timeline display. This
+    consists of a number of rulers, a meter track, a tempo track and the
+    marker display.
+  </para>
+
+  <para>
+    The available rulers include:
+  </para>
+
+  <table id="tbl-rulers">
+    <title>Ruler Types</title>
+    <tgroup cols = "2">
+      <colspec colnum="1" colname="Ruler Type" colwidth="1"/>
+      <colspec colnum="2" colname="Description" colwidth= "2"/>
+      <thead>
+        <row>
+          <entry>
+            Ruler Type
+          </entry>
+
+          <entry>
+            Description
+          </entry>
+        </row>
+      </thead>
+      <tbody>
+        <row>
+          <entry>
+            Frames
+          </entry>
+
+          <entry>
+            this ruler measures audio frames. The number of audio frames per
+            second depends on the sample rate in use.
+          </entry>
+        </row>
+
+        <row>
+          <entry>
+            SMPTE
+          </entry>
+
+          <entry>
+            this ruler displays SMPTE timecode. The SMPTE format (25fps,
+            30fps, drop frame etc) is selected in the Options Editor
+            option_editor.
+          </entry>
+        </row>
+
+        <row>
+          <entry>
+            Min:Sec
+          </entry>
+
+          <entry>
+            this ruler displays time in minutes+seconds, measured since the
+            start of the session.
+          </entry>
+        </row>
+
+        <row>
+          <entry>
+            BBT
+          </entry>
+
+          <entry>
+            <para>
+              (Bars,Beats,Ticks) this ruler displays positions based on the
+              tempo map.
+            </para>
+          </entry>
+        </row>
+      </tbody>
+    </tgroup>
+  </table>
+
+  <para>
+    To show or hide one or more of the rulers, click on the area to the left
+    of their names. A menu will popup that has a check item for each
+    available ruler. Click on the name of the ruler to toggle its
+    visibility.
+  </para>
+
+  <para>
+    The tempo and meter tracks display the tempo map for the session. The
+    tempo track contains 1 or more tempo change points, with a default tempo
+    of 120 beats per minute. The meter track contains 1 or more meter change
+    points, with an initial default meter of 4/4.
+  </para>
+
+  <para>
+    on a tempo/meter change point to edit it. Click in the tempo/meter track
+    to add a new change point. Click and drag on a change point to move it.
+    on a tempo/meter change point to remove it.
+  </para>
+
+  <para>
+    There is more information on using the timeline in editing_basics.
+  </para>
+<!--
+								<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" 
+									href="Some_Subsection.xml" />
+								-->
+</section>