Looking forward for your article on XML DML! I've tried many things, but so far I failed to find any useful patterns to use the .modify() method.

My attempts so far with .modify() have been unfruitfull in applying it for anything else than trivial example code. So if you can include some examples on how to use it for example:

- to change the n-th element's value where n is not known before hand (i.e. avoid putting some constant like [1] in the xpath), or

- to change the value of an element by a value, depending on the current value in that element (again, dynamically, not by specifying something like [@e = "value1"] in the xpath.), or

- to change a value in an element in a location in a document that is is not statically known. For example when in the document the elements can be nested to any depth to form a tree and I need to modify only nodes in this tree that match specific criteria, or

- to apply .modify() repeatably on a single document to update a set of element's values in the document.