Accession relationships

Earlier exploration note

The first sketch of the accession graph, drawn by hand. Accession types is the authoritative vocabulary and the route matrix the authoritative set of edges — both generated from the code that ships.

graph LR
    BP((BioProject)) --> SRE{SRA Experiments}
    BP               --> ERR{ENA Runs}
    BP               --> BS((BioSamples))
    BP               --> GSE((GEO Series))