图8展示了如果规则使用了多个参考列，那么左外部连接就进行级联。
Figure 8 shows that the left outer join operations are cascaded if a rule USES more than one reference column.
图4展示了具有绑定的规则，它涉及来自多个表的列，这导致了在连接操作之后进行抽样。
Figure 4 shows a rule with bindings that involve columns coming from more than one table, which causes the sampling to be done after the join operation.
图10展示了在连接先前创建的规则服务facade之后的调用行为的属性。
Figure 10 shows the properties of the invoke activity after connecting to the rule service facade created earlier.
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