在这些项目之中，JPA实体已经被复制到单独的JPA项目和永久性单元之中。
In these projects, the JPA entities have already been copied into a separate JPA project and persistence unit.
显然，现在还有一些限制，当某人想暴露同一个资源的多个版本的时候，却无法复制它的实体数据。
Obviously this has some limitations when one want to expose multiple versions of the same resource without duplicating the entity data.
这种实体引用称为外部实体引用，它节省了您可能花在一次次复制并粘贴那些内容的时间。
That kind of entity reference, called an external entity reference, saves the time you might otherwise spend copying and pasting the content over and over again.
应用推荐