Vector data require far less storage than raster data because arc node lists simplify and reduce the data required to make sense of the features contained in the map.

矢量数据要求的存储要比栅格数据少得多，因为弧节点列表简化并减少了表示地图中包含的特征所需的数据。

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The core of the listing is the defnode macro that takes a node type and a vector of field names, and creates a constructor function for creating maps of that type.

这个清单的核心是defnode宏，它获取一个节点类型和一个字段名矢量，并创建一个构造函数来创建该类型的映射。

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You create a pure vector-based drawing here and render a line here from source node to destination node.

您创建了一个纯粹基于矢量的绘图，并且显示了一条从源节点到目标节点的连线。

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