人们常注重于没有最高层访问，但这类访问在任何关系中都并非频繁。
People often focus on the absence of visits at the highest levels, but those are infrequent in any relationship.
在距卡扎菲用于新闻接待及高层访问的帐篷不到100码处，一座三层行政楼上空冒出滚滚浓烟。
A huge plume of smoke rose from the site of an three-storey administrative building just 100 yards from the tent in the compound used by Col Gaddafi for media interviews and high level visits.
义务：要知道，XACML的目标之一是提供更高层次的访问控制，而不仅仅是允许和拒绝决策，义务是实现这种控制的机制。
Obligations: Remember, one of the objectives of XACML is to provide much finer-level access control than mere permit and deny decisions. Well, obligations are the mechanism for achieving this.
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