We build query set specification by the QR_XML Editor, which consists of four processes: building condition tree generator CTG, building result tree generator RTG, defining fragments and dependencies.

• 我们使用编辑器来建立QSS，这包括四个过程：构造CTG(Condition Tree Generator)和RTG(Result Tree Generator)，建立条件片断F(Fragments)和依赖关系D(Dependencies)。