substructure

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Second, the query might refer to a specific substructure of the original schema.
其二，查询可能引用旧模式特定的子结构。
This change is described in Listing 9, where the subelements of are composed in one plain element (with no substructure).
清单 9 描述了这种变化，子元素由一个简单元素（没有子结构）组成。
Each schema definition deals with a single namespace, and although it can reference and use elements defined in another namespace, it cannot define a substructure for those elements.
每一个模式定义都对应一个名称空间，虽然它可以引用和使用其他名称空间中定义的元素，但是它不能为这些元素定义子结构。

And when you have an optimal substructure and the local solutions overlap, that's when you can bring dynamic programming to bear.
当你得到一个最优子结构,但局部解决方案有重跌时，你就可以引入动态编程,来解决这个问题了。
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So let's ask, is there an optimal substructure to this problem.
所以让我们问问，这个问题是否有最优子结构。
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And the other one was optimal substructure.
另一件就是最优子结构。
麻省理工公开课 - 计算机科学及编程导论课程节选

Responsibility for the rest of the Coda — the substructure, the electric motors, the body, the interior — is all farmed out to automotive suppliers.
FORBES: Coda Automotive's Electric Vehicle Has An Uphill Climb Ahead