I can vaguely remember working on systems in the finance industry that combined vendor XML, various internal XML schemas and transformed these into XSL-FO docum

I can vaguely remember working on systems in the finance industry that combined vendor XML, various internal XML schemas and transformed these into XSL-FO documents for rendering through multiple passes through XSLT. If I had to guess the chances of there being some element names clashing without namespaces would have been fairly high.