There's a number of features that the eclipse java environment provides that would be very useful for debugging complex xslt/xqueries. These include:
- Mark occurrences
- Tooltip for user-defined functions showing function prototype (ie argument names)
- F3 to navigate from a function call to the function declaration. (NB "Search/Declarations in Project" doesn't work here).
Are you missing a feature? Request it's implementation here.