This useful site: http://www.oracle.com/webfolder/technetwork/jsc/xml/ns/javaee/index.html lists all popular schemas for JavaEE 5 to 7 version.
However, XML deployment descriptors are rather unusual in JavaEE 5/6/7, so if you are using the reference site above frequently it may indicate a slight over engineering :-)
See you at Java EE Workshops at MUC Airport!
NEW 2016: Java EE 7 Workshops: Bootstrap, Effective, Architectures, April, 4th-6th, Munich's Airport
On demand workshops: Java EE 7 Bootstrap, Effective Java EE 7 and NEW: Java EE 7 Testing are available for streaming