To generate PDF output from your XProc pipeline (when using the Calabash XProc processor), follow these steps:
<system-property name="com.xmlcalabash.fo-processor"
value="com.xmlcalabash.util.FoXEP"/> system property.
<system-property name="com.renderx.xep.CONFIG"
file="../../../tools/xep/xep.xml"/> system property. Edit the
@file attribute to point to the configuration file that is usually
located in the XEP installation folder.