[libdmapsharing] Return of object tree to documentation

[W. Michael Petullo <wmpetullo src gnome org>]

commit 3e10964205128643ebf7e26a01f0156496a0bba8
Author: W. Michael Petullo <mike flyn org>
Date:   Sun Mar 25 00:05:16 2018 -0400

    Return of object tree to documentation
    
    Signed-off-by: W. Michael Petullo <mike flyn org>

 doc/libdmapsharing-4.0-docs.xml |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/doc/libdmapsharing-4.0-docs.xml b/doc/libdmapsharing-4.0-docs.xml
index 68b338f..f0103a7 100644
--- a/doc/libdmapsharing-4.0-docs.xml
+++ b/doc/libdmapsharing-4.0-docs.xml
@@ -66,12 +66,10 @@
         <xi:include href="xml/dmap-utils.xml"/>
   </chapter>
 
-<!--
   <chapter id="object-tree">
     <title>Object Hierarchy</title>
-    <xi:include href="xml/tree_index.xml"/>
+    <xi:include href="xml/tree_index.sgml"/>
   </chapter>
--->
   <index id="api-index-full">
     <title>API Index</title>
     <xi:include href="xml/api-index-full.xml"><xi:fallback /></xi:include>