XML
The Extensible Markup Language (XML) is a general-purpose specification for creating custom markup languages.[1] It is classified as an extensible language because it allows its users to define their own elements. Its primary purpose is to facilitate the sharing of structured data across different information systems, particularly via the Internet,[2] and it is used both to encode documents and to serilize data. In the latter context, it is comparable with other text-based serialization languages such as JSON and YAML
XML > Databases
DbcDOM - XML library for DATABUS language. There are basic functions for export/import XML files. Includes additional classes for LinkedLists, Stacks, and Exceptions.
http://dbcdom.sourceforge.net/
XML and Databases - Discusses the relationship between XML and databases. Describes some of the types of software available to process XML documents with databases.
http://www.rpbourret.com/xml/XMLAndDatabases.htm