Complex type definitions support derivation by extension and restriction, allowing you to define complex type hierarchies in a way that maps nicely to 00 class hierarchies.
复杂类型定义支持通过扩展和限制进行派生，这就允许以一种映射到面向对象类层次结构的方式定义复杂类型层次结构。
Secondly, we have designed cross network graph so as to construct and analyse the DNA restriction physical maps. Examples ars given to show the advantages of the approach.
提出一种DNA物理图谱的交叉位置网络图（简称交叉位置图），并通过实例说明它在构建物理图谱和分析酶切实验中的应用意义。
Secondly, we have designed cross network graph so as to construct and analyse the DNA restriction physical maps. Examples ars given to show the advantages of the approach.
提出一种DNA物理图谱的交叉位置网络图（简称交叉位置图），并通过实例说明它在构建物理图谱和分析酶切实验中的应用意义。
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