Tōng xuán xiān sheng 通玄先生 (“Master Penetrating the Mystery”) is a pseudonym (or honorific) used by a 10th-century(?) Daoist author, credited with KR5d0058 Dào tǐ lùn 道體論 — a Daoist philosophical treatise on the body (tǐ) of the Way; and also named in the Daoist canon as the author (zhuàn 譔) of the Xuánzhū gē 玄珠歌 (KR5b0278), a sequence of seven-character verses on the inner-alchemical “mysterious pearl” of the xìngmìng 性命 cultivation. Some SòngYuán catalogers identify the title with the early-Northern-Sòng recluse Zhāng Jiànmíng 張薦明 of the Wǔdāng 武當 / Lǚshān 廬山 traditions. (Distinguish from “通玄先生” as the imperial canonization-title given to Zhāng Zhìhé 張志和.) The same Tōngxuán xiānshēng persona also issued the parent text of the Xuánzhū xīnjìng 玄珠心鏡 corpus, on which the commentaries KR5b0279 (by 衡嶽真子) and KR5b0280 (by 長孫滋 / 棲真子 王損之) are built. No precise CBDB record recoverable.