DBX works using XML files as its native format. The database can be queried using standard SQL queries. DBX is the smallest, platform independent DBMS, and is extremely easy to migrate to. For small databases, it is a good substitute for MySQL, Oracle, etc. The added advantage is that it saves the data as neat, readable, XML files, allowing easy compatibility.
libZI is a portable configuration file API that utilizes XML for data storage and retrieval. It provides the developer and end user with a very easy-to-use API and an easy-to-modify configuration file. It can effectively and consistently store and retrieve data verbatim through use of primitive datatypes.
FramerD is a semi-structured object database integrated with a Scheme-based scripting language which supports multi-lingual programming (with pervasive Unicode), a stable module system for programming in the large, distributed applications (via an extensible RPC protocol), non-deterministic (PROLOG-like) evaluation for search and set operations, multi-threaded program execution, extensive tools for text and language analysis, built-in HTML/XML/MIME parsers, and intuitive (CGI- and FastCGI-based) Web scripting. The built-in object database robustly supports millions of objects and indexed access to those objects, both through disk files and networked servers.
e-xml is a collection of XML parsers in Java designed for handling XML data streams efficiently and easily. Its DOM parsing speeds are comparable to Xerces DOM, and pull-parsing speeds are faster than Xerces Crimson SAX's by a factor of ten. It was initially built to parse and handle large XML-RPC documents.
LuMriX is a search engine that exploits XML and XML Topic Maps. In contrast to other retrieval methods, it does not relate single items to resources, but combines given items into meaningful associations (concepts), which are in turn linked to resources. XML Topic Maps allow an intelligent mapping of relations between terms and pages. The meaning of the query is captured by transverse joint relations between the search items. LuMriX is also able to auto-extend its thesaurus and create new relations between failed search items and information resources. It is completely implemented in Java. It can consist of many individual distributed LuMriX servers, which communicate with each other by distributed algorithms. Standardized interfaces such as TCP, SOAP, HTTP, XML, and XTM allow simple utilization and maintenance by other applications.