XpressDox uses XSLT technology to insert data elements into Merge Fields. This means that a vast amount of functionality is available to the experienced user, especially the XSLT functions, which are used to format data. XpressDox functions and XSLT functions can be mixed in one Merge Field
Use Google to find help fast. For example, search on "xpressdox choosefromlist".
Repeating data elements presents a challenge to the template author, especially in formulating sentences and descriptions where the number of parties or invoice items or other repeating data is unknown at the time of authoring the template. This recipe in the Cookbook demonstrates how XpressDox meets this challenge.