图 3-2中的模式 A 将有效。专辑、艺术家和曲目被建模为节点。它没有将流派作为任何查询条件的一部分；流派只是一个返回属性，并以此建模。在模型 B 和 C 中，将流派作为节点或标签建模是多余的。
让我们继续使用相同的数据，但尝试两种不同的使用情况：
查找一个或多个流派的所有艺术家，并返回他们的曲目和专辑。
查找共享流派的艺术家。
图 3-4所示的模型 B 适用于这些任务。由于流派被建模为节点，因此查询可以从它们开始，也可以遍历它们。专辑并不重要，因此它可以作为曲目的一个属性开始，直到它变得重要为止。 ...
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