Chángsūn Zī 長孫滋 (zì Jùzé 巨澤, also styled Wángwūshānqiáo 王屋山樵, “Woodcutter of Mt. Wángwū”) was a Táng-period Daoist of the Xuánzhū 玄珠 transmission, identified in the Daoist canon as the transmitter (chuán 傳) of KR5b0280 (Xuánzhū xīnjìng zhù); the chapter-by-chapter annotation (zhāngjù 章句) is by his contemporary 王損之 (棲真子, Qīzhēnzǐ). The textual occasion is given as the strange biographical tale of Cuī Shàoxuán 崔少玄, daughter of Cuī Gōng 崔恭 (prefect of Fénzhōu 汾州), married to Lú Chuí 盧陲 (a cóngshì 從事 in Fújiàn) — a Heavenly-Maid-fallen-to-earth narrative that the commentary uses as a doctrinal hook. The catalog meta of Kanripo records the name as 長孫紫 — almost certainly a copyist’s slip; the source text of KR5b0280 itself reads 長孫滋. No CBDB record located.