The steps for configuring a data source for connecting to an Oracle 11g server are the
Go to Preferences > Data Sources.
Click the New button in the
Data Sources panel.
The dialog for configuring a data source will be opened.
Data Source Drivers Configuration Dialog
Enter a unique name for the data source.
Select Oracle in the driver type combo box.
Add the Oracle driver file using the Add button.
The Oracle driver file is called ojdbc5.jar. In the Download links for database drivers section
there are listed the URLs from where to download the drivers necessary for accessing
Oracle databases in Oxygen XML Developer.
Select the most suited Driver class.
Click the OK button to finish the data source