[android-developers] No resource identifier found for attribute 'tabLayout' in package 'android'

Is there any reason that the attribute android:tablayout isn't
publicly available? I can find it in the source here:

https://github.com/android/platform_frameworks_base/blob/master/core/res/res/values/attrs.xml#L2912

but it doesn't show up in the docs here:

http://developer.android.com/reference/android/widget/TabWidget.html

nor does it work if I try to use it in Eclipse. Am I doing something
wrong or was it hidden for some reason?

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