Metamodels are relatively easy to understand; they are similar to an entity-relationship model.

元模型相对容易理解；它们与实体关系模型非常相似。

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The entity-relationship model has gained acceptance in database design and is widely used in practice.

实质- 联系的模型已经得到数据库的接收设计并且广泛地被用于练习。

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If, however, the majority of your data fits better in a highly structured entity-relationship model and is less document-like and more intertwined, then choosing an NXD might not help your situation.

但是，如果大多数数据更适合采用高度结构化的实体-关系模型，数据不太像文档并且关系更复杂，那么选择NXD可能并不合适。

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