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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 XProc tab contains the following options:
Specify the source XSL file to be used by the transformation. You can specify the path by using the text field, its history drop-down, the Insert Editor Variables button, or the browsing actions in the Browse drop-down list. This URL is resolved through the catalog resolver. If the catalog does not have a mapping for the URL, the file is used directly from its remote location.
Allows you to select the XProc engine to be used for the transformation. You can select the Add-on for Calabash XProc engine or a custom engine that is configured in the XProc Preferences page.