What are the advantages of an XML Database compared to RDBMS storage?
The advantages of using an XML repository over an RDBMS come from the reduced mismatch between the application-programming model and the data storage model. In particular applications that deal with document content or non-tabular information benefit from using an XML database. Any information that has no schema, conforms only loosely to a schema, or conforms to a schema that is extensible, or changes frequently is a good candidate. Find more here.