قَامَ عَبْدُ اللَّهِ بْنُ عُمَرَ.
قَامَ: past verb.
عَبْدُ: nominative subject with ḍammah; muḍāf.
اللَّهِ: genitive muḍāf ilayh with kasrah.
بْنُ: nominative follower; treated by the book as an explanatory follower here; also muḍāf.
عُمَرَ: genitive muḍāf ilayh, marked by fatḥah because ʿUmar is diptote.
The nominative «بْنُ» can itself govern a genitive complement.
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ʿAṭf al-Bayān: Definition, Examples, and Contrast with Badal
قَامَ عَبْدُ اللَّهِ بْنُ عُمَرَ.
قَامَ: past verb.
عَبْدُ: nominative subject with ḍammah; muḍāf.
اللَّهِ: genitive muḍāf ilayh with kasrah.
بْنُ: nominative follower; treated by the book as an explanatory follower here; also muḍāf.
عُمَرَ: genitive muḍāf ilayh, marked by fatḥah because ʿUmar is diptote.
The nominative «بْنُ» can itself govern a genitive complement.