From IRC:

gmorling emmanuel: if for an embeddable is given an explicit column name via @Column, that's appended to the name of the embbeddable role in the embedding object itself, right? 21:06
gmorling e.g. if there is @Column("zip") within the embeddable, the tuple column should be address.zip 21:07
emmanuel you will need to look at the naming strategy 21:07
emmanuel in ORM it would be zip 21:08
emmanuel not address.zip 21:08

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      gmorling ah, that's interesting 21:09
      gmorling i guess for mongo i'd more expect address.zip 21:09
      gmorling i.e. keep it within the sub-document 21:09
      gmorling atm. it is pulled out to the outer document 21:09
      emmanuel accoring to logicalColumnName.logicalColumnName I would say it would be "zip" 21:09
      gmorling do you think thats good for doc stores? 21:10
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      emmanuel no it does not look too good 21:13
      emmanuel esp since we use the fact that a dot separates nested elements 21:14
      emmanuel but the problem is there is no JPA option to override a column prefix of an embeddable 21:14
      emmanuel if you see what I mean 21:14
      emmanuel so the first columns in a dotted representation will always be the property names 21:15
      emmanuel and the last column could be the acutal @Column 21:15
      gmorling so an @Column on the outer prop would be ignored in this case? 21:17
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      gmorling emmanuel: ^ 21:17
      emmanuel yes 21:18
      emmanuel logicalColumnName only receives one column and one property name 21:18
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      gmorling can one give a dot name via @Column? i guess not? 21:19
      emmanuel yes I think you can 21:21
      emmanuel @column(name="a.b.c") 21:21
      emmanuel that's a workaround indeed 21:21
      emmanuel which would imply thta we should not prefix @Column by it's outer property names 21:22
      emmanuel gmorling: ^ 21:22
      gmorling i see 21:22
      emmanuel so if you want to keep the structure, you would use the dots 21:22
      gmorling it fails only if an embeddable is used in different roles in different entities 21:22
      emmanuel and since embedded object are reused sometime, you might need to use @AttributeOverride to override the column on the embedding side 21:23
      emmanuel more verbose but doable