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[Hibernate] Canonical vs Reference Data

 
Pho Tek
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Please have a read of this forum posting at hibernate.org. Can somebody explain what's the difference between canonical data and reference data ?
e.g.
Are postcodes canonical/reference data ?
Are states canonical/reference data ?
My understanding is that canonical data are quite concrete and will not change often.Whereas reference data are prone to changes ? e.g. the categories of blog items on my weblog may change - depending how wide I read - thus, it is reference data.
Regards,
Pho
 
It is sorta covered in the JavaRanch Style Guide.
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