add/update license headers
diff --git a/hyracks/hyracks-documentation/src/books/user-guide/doxia-descriptor.xml b/hyracks/hyracks-documentation/src/books/user-guide/doxia-descriptor.xml
index 1fb3c0c..d3c715b 100644
--- a/hyracks/hyracks-documentation/src/books/user-guide/doxia-descriptor.xml
+++ b/hyracks/hyracks-documentation/src/books/user-guide/doxia-descriptor.xml
@@ -1,3 +1,17 @@
+<!--
+ ! Copyright 2009-2013 by The Regents of the University of California
+ ! Licensed under the Apache License, Version 2.0 (the "License");
+ ! you may not use this file except in compliance with the License.
+ ! you may obtain a copy of the License from
+ !
+ ! http://www.apache.org/licenses/LICENSE-2.0
+ !
+ ! Unless required by applicable law or agreed to in writing, software
+ ! distributed under the License is distributed on an "AS IS" BASIS,
+ ! WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ! See the License for the specific language governing permissions and
+ ! limitations under the License.
+ !-->
<book xmlns="http://maven.apache.org/BOOK/1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/BOOK/1.0.0 ../../../doxia/doxia-book/target/generated-site/xsd/book-1.0.0.xsd">