غُلَامُ زَيْدٍ: implied lām — belonging or association.
خَاتَمُ فِضَّةٍ: implied min — material or kind.
صَلَاةُ اللَّيْلِ: implied fī — time or setting.
The second noun remains genitive mudāf ilayh in all three. What differs is the semantic relationship, not the grammatical case.
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Al-Majrūrāt — Semantic and Formal Iḍāfah
غُلَامُ زَيْدٍ: implied lām — belonging or association.
خَاتَمُ فِضَّةٍ: implied min — material or kind.
صَلَاةُ اللَّيْلِ: implied fī — time or setting.
The second noun remains genitive mudāf ilayh in all three. What differs is the semantic relationship, not the grammatical case.