Institut für Informationssysteme

The XOBEDBPL project

 deutsche Version

Brief description of the project:

XML as data exchange format between different applications gains more and more importance. Today applications in general manipulate and operate on objects. Therefore an exchange implies a mapping process between objects and XML data and vice versa. Moreover if an application stores the same data persistently, most often relational databases are used for performance reasons. This also implies another mapping process between the objects of the programming language and the tables or tuples of the relational database. Once again the mapping process is needed in both directions. Programmers of such applications have to use a lot of different interfaces (APIs) or complex frameworks.  In the XOBEDBPL (XML OBjEcts DataBase Programming Language) project a language based on Java is developed avoiding these mapping processes. Java is syntactically and semantically extended by XML, XPath and update expressions. Furthermore a persistent environment is introduced integrating transparent and type independent persistency. Data consistency in the context of multi user access is going to be developed with the help of transaction integration and support in Java.

Finished Work:

• Integration of XML in Java by XML objects
• Integration of XML Schema und DTD basics
• Integration of XPath for XML object queries
• Integration of update expressions for XML objects
• Static Typecheck for XML objects, queries and updates

Current and Future Work:

• Type independent persistency and transaction concepts in XOBEDBPL

Implementation:

• The Precompiler
• The prototypical runtime environment
• (current work) runtime environment for shared, persistent data

Precompiler:

• Precompiler implementation is finished
• full XOBEDBPL  runtime environment is under development

In the context of the XOBE project bachelor, masters and students theses are currently available. If you are interested, please contact the project members.

Involved members of the Institute of Information Systems

• Dr. rer. nat. Henrike Schuhart (former)
• Dr. rer. nat. Martin Kempa (former)
• Prof. Dr. rer. nat. Volker Linnemann

Involved students

• Dominik Pietzsch (bachelor thesis)

Publications