Regarding #21 Identification of fragments, I agree with the concern raised by Eugene and Stephan. My understanding of what could be an example of a fragment (of an accession entity) might be seeds of an accession from a given harvest year (I have seen this
thing to be called a batch). And if there is a need to identify such "fragment"-things, a clean opaque PUID for such things would generally be preferred compared to to appending codes to the accession-level PUID identifier string. Perhaps there are other use
cases, but in general I agree with these concerns.
Dag