copy from xml/en/docs/njs/njs_api.xml
copy to xml/en/docs/njs/reference.xml
--- a/xml/en/docs/njs/njs_api.xml
+++ b/xml/en/docs/njs/reference.xml
@@ -6,10 +6,10 @@
 
 <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd">
 
-<article name="njs API"
-        link="/en/docs/njs/njs_api.html"
+<article name="Reference"
+        link="/en/docs/njs/reference.html"
         lang="en"
-        rev="8">
+        rev="9">
 
 <section id="summary">
 
@@ -1041,7 +1041,7 @@ All string properties of the object are 
 
 <para>
 <note>
-Prior to njs <link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>,
+Prior to njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>,
 the stream session object had some properties which are currently
 <link id="stream_obsolete">removed</link>.
 </note>
@@ -1053,26 +1053,26 @@ the stream session object had some prope
 <tag-name id="s_allow"><literal>s.allow()</literal></tag-name>
 <tag-desc>
 successfully finalizes the phase handler
-(<link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>)
+(<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>)
 </tag-desc>
 
 <tag-name id="s_decline"><literal>s.decline()</literal></tag-name>
 <tag-desc>
 finalizes the phase handler and passes control to the next handler
-(<link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>)
+(<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>)
 </tag-desc>
 
 <tag-name id="s_deny"><literal>s.deny()</literal></tag-name>
 <tag-desc>
 finalizes the phase handler with the access error code
-(<link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>)
+(<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>)
 </tag-desc>
 
 <tag-name id="s_done"><literal>s.done</literal>(<value>[code]</value>)</tag-name>
 <tag-desc>
 successfully finalizes the current phase handler
 or finalizes it with the specified numeric code
-(<link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>).
+(<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>).
 </tag-desc>
 
 <tag-name><literal>s.error(<value>string</value>)</literal></tag-name>
@@ -1090,14 +1090,14 @@ on the <literal>info</literal> level of 
 <tag-name id="s_off"><literal>s.off(<value>eventName</value>)</literal></tag-name>
 <tag-desc>
 unregisters the callback set by the <link id="s_on">s.on()</link> method
-(<link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>)
+(<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>)
 </tag-desc>
 
 <tag-name id="s_on"><literal>s.on(<value>event</value>,
 <value>callback</value>)</literal></tag-name>
 <tag-desc>
 registers a <literal>callback</literal> for the specified <literal>event</literal>
-(<link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>).
+(<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>).
 
 <para>
 An <literal>event</literal> may be one of the following strings:
@@ -1140,7 +1140,7 @@ client address, read-only
 <value>options</value>])</literal></tag-name>
 <tag-desc>
 sends the data to the client
-(<link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>).
+(<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>).
 The <literal>options</literal> is an object used
 to override nginx buffer flags derived from an incoming data chunk buffer.
 The flags can be overriden with the following flags:
@@ -1180,7 +1180,7 @@ on the <literal>warning</literal> level 
 
 <para>
 These properties have been removed
-in njs <link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>
+in njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>
 and are not backward compatible with the existing njs code.
 </para>
 
@@ -1191,7 +1191,7 @@ and are not backward compatible with the
 <tag-desc>
 the <literal>ABORT</literal> return code
 <note>
-Starting from njs <link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>,
+Starting from njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>,
 the <link id="s_deny">s.deny()</link> method should be used instead.
 </note>
 </tag-desc>
@@ -1200,7 +1200,7 @@ the <link id="s_deny">s.deny()</link> me
 <tag-desc>
 the <literal>AGAIN</literal> return code
 <note>
-Starting from njs <link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>,
+Starting from njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>,
 the corresponding behavior is achieved if no
 <link id="s_allow">s.allow()</link>,
 <link id="s_deny">s.deny()</link>,
@@ -1214,7 +1214,7 @@ is invoked and a callback is registered.
 <tag-desc>
 the current buffer, writable
 <note>
-Starting from <link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>,
+Starting from <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>,
 the <link id="s_send">s.send()</link> method should be used for writing.
 For reading, the current buffer is available as the first argument of the
 <literal>event</literal> callback.
@@ -1225,7 +1225,7 @@ For reading, the current buffer is avail
 <tag-desc>
 the <literal>DECLINED</literal> return code
 <note>
-Starting from njs <link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>,
+Starting from njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>,
 the <link id="s_decline">s.decline()</link> method should be used instead.
 </note>
 </tag-desc>
@@ -1234,7 +1234,7 @@ the <link id="s_decline">s.decline()</li
 <tag-desc>
 a boolean read-only property, true if the current buffer is the last buffer
 <note>
-Starting from <link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>,
+Starting from <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>,
 the <link id="s_on_callback_last">flags.last</link> property
 should be used instead.
 </note>
@@ -1244,7 +1244,7 @@ should be used instead.
 <tag-desc>
 the <literal>ERROR</literal> return code
 <note>
-Starting from njs <link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>,
+Starting from njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>,
 an appropriate exception can be thrown to report an error.
 </note>
 </tag-desc>
@@ -1254,7 +1254,7 @@ an appropriate exception can be thrown t
 a boolean read-only property,
 true if the current buffer is from the upstream server to the client
 <note>
-Starting from <link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>,
+Starting from <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>,
 a corresponding <link id="s_on">event</link>
 (<literal>upload</literal> or <literal>download</literal>)
 should be used to handle data to or from client.
@@ -1265,7 +1265,7 @@ should be used to handle data to or from
 <tag-desc>
 the <literal>OK</literal> return code
 <note>
-Starting from njs <link doc="../njs/njs_changes.xml" id="njs0.2.4">0.2.4</link>,
+Starting from njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>,
 the <link id="s_allow">s.allow()</link> method should be used instead.
 </note>
 </tag-desc>