Yuqi Liang Aoying Zhou Shihui Zheng Long Zhang Wenyun Ji Enhancing XML Data Processing in Relational System with Indices. 168-178 2001 conf/waim/2001 WAIM https://doi.org/10.1007/3-540-47714-4_16 db/conf/waim/waim2001.html#LiangZZZJ01