Daozang Organization — The Three Caverns and Four Supplements

Unlike a modern library classification organized by subject matter, the Daozang's structure reflects a theological claim about the relative status and origin of different revelation streams within Taoism.

The Three Caverns (San Dong)

Cavern of Perfection (Dongzhen): Contains the Shangqing revelations, considered the highest and most refined teachings, associated with the celestial realm of Highest Clarity.

Cavern of Mystery (Dongxuan): Contains the Lingbao scriptures, associated with communal ritual and the Numinous Treasure revelations.

Cavern of Spirit (Dongshen): Contains the Sanhuang (Three Sovereigns) texts, an older and by the canon's compilation partially lost tradition of talismanic and exorcistic material.

The Four Supplements (Si Fu)

Added to accommodate texts that didn't fit neatly into the three-cavern hierarchy: the Taixuan supplement (associated with the Daodejing and philosophical texts), the Taiping supplement (the Taiping Jing tradition), the Taiqing supplement (external alchemy texts), and the Zhengyi supplement (Celestial Masters ritual material) — this last section notably serving to incorporate the entire Zhengyi tradition's texts as a category of their own alongside the three caverns.

What the Structure Reveals

This organization encodes a specific narrative: that the most refined revelations (Shangqing) sit at the top, older magical practice (Sanhuang) is acknowledged but positioned as more primitive, and Zhengyi's massive ritual corpus — despite representing the oldest continuously practiced organized Taoist lineage — is treated as a supplementary category rather than a "cavern" proper, reflecting complex historical negotiations between rival lineages as they consolidated into a single textual canon during the medieval period.

Practical Use

For centuries, few individuals had access to a complete Daozang; regional temples typically held partial collections relevant to their own lineage and ritual specialization. A Zhengyi priest's working library differed substantially from a Shangqing adept's, even though both technically belonged to the same overarching canonical tradition.