Fixed bug where BooleanQueryBuilder.java and BooleanFilterBuilder.java were mistakenly adding all child (and grandchild) clauses to the top node. A call to Element.getElementsByTagName was the offending code - this descends full depth rather than getting only immediate children which is the desired behaviour. Thanks to Jingkei Ly for spotting this bug.
lucene/java/trunk/contrib/xml-query-parser/src/java/org/apache/lucene/xmlparser/builders/BooleanFilterBuilder.java