I do not know what, if anything else, reads it. (In fact, I didn't realize Byzantium did.) But my instinct is to change change said XSLT in a branch (or some other way it's easy to revert), and don't worry about it until if & when there's a problem. JC> There were some other people who had built things on top of JC> it.... I don't remember what though. I remember us getting some JC> questions about it at some point though. What are the kinds of JC> changes you want to make? As long as not drastic then I don't see JC> why not. We don't claim it is a perfect serialization to JSON. 😉 RV> Does anyone know if p5subset.json is used for anything except RV> Byzantium at the moment? In short, can I change the XSLT that RV> generates it as I please?