此外，简化视见体的可见性判断和数据预取策略，实现可见数据的动态管理。
In addition, dynamical management of terrain dataset in view field was implemented effectively by visible detection based on the simplified view frustum and terrain data prediction strategy.
如果将数据限制为清单1中单个文档中的可见数据，那么计算清单2中的XPath表达式总是正确地返回清单3中的结果。
If you limited the data to the visible data in the single document in Listing 1, then evaluating the XPath expression in Listing 2 always correctly returns the result in Listing 3.
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