成唯識論了義燈 7.103

7.103

此空、有二相，西明云：三藏二解。一云於四位中初二觀所取空，後二觀能取空。如是觀時，名等四種或六、或四假有實無。假有是依他性，即是有相；實無即遍計，此即空相。二相皆滅，安立真性。

Regarding these two appearances of emptiness and existence, Ximing says: The Tripiṭaka Master had two explanations. The first states: Among the four stages, the first two contemplate the emptiness of the grasped, and the latter two contemplate the emptiness of the grasper. When contemplating in this manner, the four kinds [of investigations] into names and so forth—or six, or four—are conventionally existent but substantially non-existent. Conventional existence is the other-dependent nature, which is the appearance of existence; substantial non-existence is the conceptually constructed nature, which is the appearance of emptiness. When both appearances are extinguished, one establishes the true nature.