UML Diagrams for Data Mapping

[Koala]

Hi,

I am documenting the data mapping, logic and tranformation process for creating an XML document from an Oracle database in a data flow project and I'm not sure which UML diagram(s) is best to do this.

The system has already been implemented using pl/sql so there is no need to design it, just document what has been done for maintainence and future enhancements.

Thanks in advance.