Qāriʾan is an accusative quasi-construct vocative. Al-kitāba is the object governed by the active participle, not a genitive possessive.
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A Vocative Resembling a Muḍāf
Vocative Particles: Five Forms, Uses and Parsing
Qāriʾan is an accusative quasi-construct vocative. Al-kitāba is the object governed by the active participle, not a genitive possessive.