数据词典用于捕获不同数据元素的含义和表示形式，并就此进行交流，最常用于关系数据库。
A data dictionary is used to capture and communicate the meaning and representation of various data elements, most commonly for relational databases.
要发挥面搜索的威力，原生xml引擎需要能够从一个元素在数据库中具有的值构建词典。
To deliver the power of faceted searches, native XML engines need to be able to build lexicons from the values that an element takes on in the database.
与可以包含不同类型元素的列表、元组和词典不同的是，Numarray数组只能包含同一类型的数据。
In contrast to lists, tuples, and dictionaries, which may contain heterogeneous elements, Numarray arrays contain only elements of a homogeneous data type.
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