数据库设计师长期使用术语“星型模式”来描述维度模型，因为结果结构看上去像一个星星。
Database designers have long used the term "star schema" to describe dimensional models because the resulting structure looks like a star.
Ruby on Rails迁移可以解决前面描述的涉及数据库和数据结构更改的一些问题。
Ruby on Rails migration solves some of the problems described above involving the database and data structure changes.
简言之，DTD 描述了词汇表的结构（标记和属性），类似于数据库模式描述数据库的结构（表和列）。
Essentially a DTD describes the vocabulary's structure (the tags and attributes), similar to the way a database schema describes a database's structure (the tables and columns).
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