规范中没有该特性的部分原因是缺少用于引用 EJB 组件群的机制，例如，使用通配符的语言表达方式。

Part of the reason this feature is missing from the specification is the lack of a mechanism for referring to a group of EJB components, for example, through an expression language with wildcards.

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其目的在于提高基于相似字符串匹配的查询在大规模字符串数据库中的查询效率，并且提供带通配符的字符串查询方式。

The purposes of it were to improve the efficiency of searching a string in a large-scale database by the means of approximate string matching and to provide a means to search a string with wildcards.

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