Stephen says XML is known to APL programmers as an über-corporate format for data interchange; also a 'barrier' technology for APLers who want work in IT shops. Most production XML is strikingly verbose and apparently intended for machine reading only. Nothing could appear less relevant to Direct Development. Here he shows how to use XML to create a data language with high semantic density, creating non-trivial and highly portable data structures that non-tech users maintain with text editors.