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Optional XML in relational databases, Part 2: Create, store, and manipulate optional XML data with JAXB and Java annotations
Explore the software required to create, store, and manipulate optional XML relational data in this article -- the second in a two-part series. The software used includes fully worked code examples with Java(TM) Architecture for XML Binding (JAXB), the Java Persistence API (JPA)/Hibernate, an in-memory database, and persistence-related annotations. 		Articles 07 Jul 2009  
 
Optional XML in relational databases, Part 1: Are null values needed?
Optional XML elements -- for example, online forms -- are special in that they might or might not appear in XML files. Representing such optional elements is a challenge both in programming languages and in databases. In many cases, null values are inserted in databases to represent empty optional elements, but null database XML values can be difficult to retrieve. Discover alternative, less-invasive approaches to handling optional XML elements without the need for data overloading or inserting null or other sentinel values. 		Articles 07 Jul 2009  
 
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