A common issue with repeating data is the requirement to refer to the items within the list by their ordinal values.
Use Google to find help fast. For example, search on "xpressdox choosefromlist".
There are times when it is necessary to concatenate the values of data elements, variables and/or hard-coded strings together to form a value which is then stored in a variable. The concat function does this.
XpressDox give the template author the ability to perform calculations and other operations on the values of data elements, and to store those values in variables for later use in the template. One example of this is the ability to calculate totals on repeated data elements.
Here are some examples to illustrate the concept which enables the results of calculations to be stored for further use in the template, and even for future templates.