金剛經纂要刊定記 5.109

5.109

佛跡。經意云：此實相者，體當勝義但唯無相，名依世諦故言實相。

The trace of the Buddha. The intent of the sūtra is: this dharmatā, its essence pertains to paramārtha and is solely markless, while its name relies on conventional truth; hence it is called dharmatā.