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The word sādhya, which literally means that which is to be proven', too can be employed in three meanings, viz., (1) a proposition to be proven consisting of dharmin and dharma, (2) the property-possesor (sādhya-dharmin) as the topic of the proposition, and (3) the propety to be proven (sādhyadharma). Thus we can conclude that both pakṣa in NMukh and sādhya in PS III have the same range of meanings and, consequently, they refer to the same logical concept in Dignāga's system of logic.
I believe that the word anumeya, which literally means 'that which is to be inferred', also possesses the same set of three meanings, viz. (1) a state of affairs or a proposition to be inferred consisting of dharmin and dharma, (2) the property-possesor or locus to be inferred (anumeya-dharmin), and (3) the property to be inferred (anumeya-dharma), although Dignāga does not explicitly mention this.
The reason behind my conviction is that the word anumeya occupies the place of paksa in the first formula of the trairūpya. As I mentioned earlier, Dignāga refers to the first characteristic of a valid inferential mark by the traditional expression pakşadharmatva in NMukh. In PS II. 5cd, however, he refers to it by his new phrase anumeye sadbhāvaḥ, as we have seen above.16) Therefore, it seems quite possible to assume that the word anumeya is employed by Dignāga in the same way as the words paksa and sādhya in NMukh and PS III.
The word paksa seems to stem from the old Vada-tradition. In PS Dignāga seems to distinguish between anumeya and sādhya, by employing the former in svārthānumāna and the latter in parārthānumāna. A similar phenomenon can be found regarding the words referring to a logical reason; namely, hetu (reason) and sādhana (dharma) (a proving property), which seem to stem from the Vāda-tradition, are used in parārtānumāna, while linga (an inferential mark) and anumāna (a means of inference), which seem to stem from the Pramāņa-tradition, are used in svārthānumāna.
Thus Dignāga would support Oetke's first interpretation regarding the meanings of the word anumeya in the trairūpya; namely, it means the sub
