Add also xhtml1 dtd to local catalog
diff --git a/lib/dtds/xhtml/html2dita/plugin.xml b/lib/dtds/xhtml/html2dita/plugin.xml
new file mode 100644
index 0000000..39b56b1
--- /dev/null
+++ b/lib/dtds/xhtml/html2dita/plugin.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- This file is part of the DITA Open Toolkit project hosted on
+ Sourceforge.net. See the accompanying license.txt file for
+ applicable licenses.-->
+<!--
+ | (C) Copyright IBM Corporation 2006. All Rights Reserved.
+ *-->
+ <plugin id="org.dita.specialization.h2d">
+ <feature extension="dita.specialization.catalog.relative"
+ file="catalog.xml"/>
+ </plugin>