In this paper, an example is given to show that the improved QSQI algorithm presented by [1] is not correct, although ts application range is restricted to linear rules and acyclic EDB relations.

• 本文首先用具体的例子表明；即使将应用范围限于线性规则和无环的EDB关系；文[1]提出的改进的QSQI查询算法也不能成立.