For single source data, standardization of these default values may be through assigned mapping values, against a lookup table, or based on a defined pattern or algorithm within the data.
对于单个源数据，这些默认值的标准化可以通过根据一个查找表或定义好的模式或算法，在数据中指定映射值来完成。
In some cases application-specific caches can be designed in such a way that they lookup the required data from some data source that is transparent to the client.
在某些情况下，特定于应用程序的缓存可以设计为从对客户机透明的某个数据源查找所需的数据。
Typically, in an enterprise application data source objects are retrieved through a JNDI lookup operation.
在一个企业程序中，数据源对象是通过JNDI查找操作来获得的。
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