We use XSLT to generate reports and typically the destination is Excel. So the report is generally basic HTML tables and Excel will parse the table info. Today, I needed to sum an amount column but had no way of knowing how many rows were in the result. After spending considerable time on Google, I came away with this:
Seemed pretty intuitive once I found it. The problem with this is hitting the right combination of keywords when searching. So hopefully, by describing my problem here and the solution, I have narrowed someone else's search a bit.