Jeni tennison has been working on this problem for some time and has developed Jeni tennison对这个问题研究了一段时间,并开发了
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I ve also given users the capability to set up custom data types in a declarative way using jeni tennison s data type library language dtll - see 我还通过某种声明性的方法,使用户能够使用jeni tennison的data type library language ( dtll ,请参阅