As you can see in Listing 5, making a view orbit around in a circular path is very easy if you utilize constraints.
如清单5所示，如果使用约束的话，产生一个沿着圆形轨迹移动的视图非常容易。
Part 6: Path-based integrity constraints: The goal of this part is to define features similar to WXS's xs: unique, xs: key, and xs: keyref.
第6部分：基于路径的完整性约束(Path - based integrity constraints)：该部分的目的是定义与WXS的xs： unique、xs： key和xs： keyref类似的特性。
It can refresh the router table by the previous delay information to find a suitable path with the constraints of the bandwidth and the delay-jitter.
该算法直接利用前一周期的时延信息来更新路由表，以作为当前寻找路径的依据，在满足带宽和时延波动约束条件下，使数据传送过程时延最小化。
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