本文依從張崇禮之釋，認為〈封子楚簠〉器主「邦子楚」為鄭文公，並針對鄭文公自稱「邦子」與「楚王之士」之由予以申論。本文認為「邦子」乃鄭文公服喪三年內之自稱。至於「楚王之士」之稱，可能是鄭文公之父鄭厲公為取得楚文王支持，曾將鄭文公置於楚國為仕。鄭文公即位之初為表明與楚國友好關係，故強調曾為「楚王之士」之經歷。

According to the definition of Dr. Chang chóng-lǐ, the "Feng Zi Chu Fu" belongs to Duke Wen of Zheng. This article focuses on the reason why he called himself "bāngzi" (the monarch) and "the official of monarch Chǔ". This article considers that "bāngzi" is a self-proclaimed name for Duck Wen of Zheng in mourning for three years. As for "the official of monarch Chǔ", it might be Duck Wen of Zheng’s father Duck Li of Zheng needed King Wen of Chǔ’s support; therefore, he asked his son to take up the post of the official in Chǔ. Certainly, he was the official of Chǔ. At the beginning of Duck Wen of Zheng’s reign, he showed his friendship with the State Chǔ, so he emphasized the experience of being "the official of monarch Chǔ".