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Unobtrusive, not transparent

 
Ilkin Abdullayev
Greenhorn
Posts: 7
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Hi colleague!!
I decide to learn ORM and I start to read JPA book(PRO JPA2 Mastering).I dont understand one idea(sentence) from book.That say:
The persistence solution should not intrude on the domain model, however, and domain classes must not
be required to extend classes or implement interfaces in order to be persistable.


what does author mean?

======Thanks in advance========
 
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