set:difference computes the difference between two sets, returning a node-set whose nodes are in one of the arguments but not the other.

difference 将计算两个集合之间的差异，返回一个节点集，该节点集的节点位于其中一个实参，而不在其他实参中。

youdao

set:difference computes the difference between two sets, returning a node-set whose nodes are in one of the arguments but not the other.

difference 将计算两个集合之间的差异，返回一个节点集，该节点集的节点位于其中一个实参，而不在其他实参中。

youdao