what does "?" mean in Android styles.xml files mean?



in Android Framework source code ~/core/res/res/values/styles.xml


there's one line:



    <item name="android:textColor">?textColorPrimaryInverse</item>


Could anyone tell me:




  1. What does "?textColorPrimaryInverse" mean?




  2. Where is "textColorPrimaryInverse" referenced ?




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