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When you create a new transformation scenario or edit an existing one, a configuration dialog box allows you to customize the transformation with various options in several tabs.

The Options tab allows you to specify the following options:
Working directory
The path of the current directory of the Ant external process. You can specify the path by using the text field, the Insert Editor Variables button, or the Browse button.
Build file
The Ant script file that is the input of the Ant external process. You can specify the path by using the text field, the Insert Editor Variables button, or the Browse button.
Build target
Optionally, you can specify a build target for the Ant script file. If no target is specified, the Ant target that is specified as the default in the Ant script file is used.
Additional arguments
You can specify additional command line arguments to be passed to the transformation (such as -verbose).
Ant Home
You can choose between the default or custom Ant installation to run the transformation. The default path can be configured in the Ant preferences page.
Java Home
You can choose between the default or custom Java installation to run the transformation. The default path is the Java installation that is used by Oxygen XML Editor.
JVM Arguments
This parameter allows you to set specific parameters for the Java Virtual Machine used by Ant. For example, if it is set to -Xmx384m, the transformation process is allowed to use 384 megabytes of memory. When performing a large transformation, you may want to increase the memory allocated to the Java Virtual Machine. This will help avoid Out of Memory error messages (OutOfMemoryError).
Libraries
By default, Oxygen XML Editor adds libraries (as high priority) that are not transformation-dependent and also patches for certain DITA Open Toolkit bugs. You can use this button to specify additional libraries (JAR files or additional class paths) to be used by the Ant transformer.
Tip: You can specify the path to the additional libraries using wildcards (for example, ${oxygenHome}/lib/*.jar).