Over the past 20–30 years there has been a dramatic increase in the number of people living with immunosuppression. Cancer chemotherapy and the treatment of haematological disease transiently put people at risk, while the immunosuppression required for solid organ transplants and for immunemediated diseases, such as systemic lupus erythematosus, is more prolonged. In addition to these iatrogeni...

Relational database systems may be turned into efficient XML and XPath processors if the system is provided with a suitable relational tree encoding. This paper extends this relational XML processing stack and shows that an RDBMS can also serve as a highly efficient XQuery runtime environment. Our approach is purely relational: XQuery expressions are compiled into SQL code which operates on the...