Set: distinct examines a node set for nodes with the same string value and removes all but one instance of each.
distinct将检验节点集以查找拥有相同字符串值的节点,并且只保留每个节点的一个实例,而将其余都删除。
Set: distinct examines a node set for nodes with the same string value and removes all but one instance of each.
distinct将检验节点集以查找拥有相同字符串值的节点,并且只保留每个节点的一个实例,而将其余都删除。
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