> ... XML grew a "type system" of sorts with XML Schema (which is widely used IME, esp. where interfacing with external services as in SOA) ... The type system

> ... XML grew a "type system" of sorts with XML Schema (which is widely used IME, esp. where interfacing with external services as in SOA) ... The type system came from both XML Schema and XPath and was codified with XSLT 2, then expanded when XQuery was defined. It's not been a type system "of sorts" since XSLT 2, which filled in a lot of gaps and undefined behaviours.