# Kotlin and Android Development featuring Jetpack: Not clear in which package data classes should belong (version B4.0 page 126)

**URL:** <https://forum.devtalk.com/t/kotlin-and-android-development-featuring-jetpack-not-clear-in-which-package-data-classes-should-belong-version-b4-0-page-126/6758>\
**Category:** PragProg Customers\
**Tags:** book-kotlin-and-android-development-featuring-jetpack, suggestion\
**Created:** [7 February 2021 13:08 UTC](https://forum.devtalk.com/t/kotlin-and-android-development-featuring-jetpack-not-clear-in-which-package-data-classes-should-belong-version-b4-0-page-126/6758 "2021-02-07T13:08:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![keno.basedow](https://forum.devtalk.com/letter_avatar_proxy/v4/letter/k/bbce88/32.png) [@keno.basedow](https://forum.devtalk.com/u/keno.basedow)\
**Post date:** [7 February 2021 13:08 UTC](https://forum.devtalk.com/t/kotlin-and-android-development-featuring-jetpack-not-clear-in-which-package-data-classes-should-belong-version-b4-0-page-126/6758/1 "2021-02-07T13:08:26Z")

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Hello Michael,  
i am back again.  
In the chapter of Room Entities it is not perfectly clear in which package they should belong.  
In the data or types package?  
Should the player class be moved from the types package to data package?  
Or should the types package be the data package right from the start?  
Greetings Keno

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**Author:** ![mfazio23](https://forum.devtalk.com/user_avatar/forum.devtalk.com/mfazio23/32/528_2.png) [@mfazio23](https://forum.devtalk.com/u/mfazio23)\
**Post date:** [8 February 2021 00:25 UTC](https://forum.devtalk.com/t/kotlin-and-android-development-featuring-jetpack-not-clear-in-which-package-data-classes-should-belong-version-b4-0-page-126/6758/2 "2021-02-08T00:25:52Z")

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Welcome back! I’m glad you asked for clarification. The new `Entity` classes will go in the `data` package but we can just leave `Player` in the `types` package.

I added a note in chapter 5 about how all the new `Entity` classes go in `data`, hopefully that’ll be more clear.