lexicons.bio

AT Protocol lexicons for decentralized biodiversity observation data, aligned with Darwin Core and GBIF standards.

2
Lexicons
43
Fields
26%
DwC Coverage
43
Terms Mapped
bio.lexicons.occurrence
Occurrence
A biodiversity observation — an organism at a place and time.
31 fields · 27% DwC coverage
bio.lexicons.identification
Identification
A taxonomic determination for an observation.
12 fields · 24% DwC coverage

Architecture

Records use AT Protocol's strongRef (URI + CID) to create immutable links. The occurrence record sits at the center, with identifications referencing it.

identification └─ #taxon ──references──▶ occurrence └─ #location └─ #imageEmbed

Taxonomy lives in identification records, not occurrences — this enables community consensus identification where multiple users can propose IDs for the same observation.

Usage

These lexicons follow the AT Protocol Lexicon schema format. Records are stored in users' personal data servers (PDS) under the appropriate collection, referenced by NSID.

Record keys

All records use tid (timestamp-based identifier) as their record key, per the AT Protocol record key spec.

Cross-references

Records reference each other using com.atproto.repo.strongRef, which contains both a URI and CID. The CID ensures you're referencing a specific version of the target record.