difference between Theme.AppCompat, @style/Theme.AppCompat, and @android:style/Theme.AppCompat -

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what's difference between:

  • theme.appcompat
  • @style/theme.appcompat
  • @android:style/theme.appcompat

and in case should use 1 vs other?

also, make difference if write 

<style name="customactionbartheme" parent="theme.appcompat">

instead of 

<style name="customactionbartheme" parent="@style/theme.appcompat">


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