I've similarly seen simple pattern matching used in high transaction volume processing. Using a DOM based, or even a stream based processor is considered too e

I've similarly seen simple pattern matching used in high transaction volume processing. Using a DOM based, or even a stream based processor is considered too expensive. So, just look for the relevant tag and grab the next bit, while presuming that the context is correct. (This involved a limited number of trusted partners, in a relatively steady-state environment.) OTOH, it eliminated discussions/arguments about what format to use. In a corporate environment, that can be a significant win in and of itself. (Yes, "win" should be in quotes.)