He Huang Zhongzhi Shi Jianwu Wang Rui Huang DDL: Embracing Actions into Semantic Web. 81-90 2006 Intelligent Information Processing http://dx.doi.org/10.1007/978-0-387-44641-7_9 conf/ifip12/2006iip db/conf/ifip12/iip2006.html#HuangSWH06