成唯識論了義燈 6.171

6.171

又云：十二次下云：若於此處無有彼物。由此道理觀之為空，故名空性。即所觀空無可希願，故名無願。觀此遠離一切行相，故名無相。准此所說十六行相，各三所攝，依無性義，第五復次。

It also says: further below in [fascicle] twelve, it says: "If in this place that thing does not exist, by this reasoning one contemplates it as empty, and so it is called emptiness. Since what is contemplated as empty cannot be wished for, it is called wishless. Contemplating this as far removed from all aspects, it is called signless." According to what is stated here, the sixteen aspects are each subsumed by the three, based on the meaning of the lack of nature; this is the fifth alternative.