Hi, Eddie and Phil,

I'm impressed too with this xmp extensibility and with the ability of ExifTool to process it. I'm working on metadata and images for a herbarium (images of plants in particular) and considering imbedding our image database fields, very similar to those of Eddie's.

One comment about your schema, Phil. You mention the list for Phylogeny, but I think you didn't define it. I assume the .exiftool_config entry should look like

and seems to be intended to store alternatives (in different languages?), rather than the hierachical information presented by Eddie. In the dotted format of IMatch categories, the Phylogeny field would be "Insecta.Coleoptera.Coccinellidae.Coccinella californica".

By the way, there is an organisation, the Taxonomic Database Working Group (TDWG) which already administers a number of world standards for biological metadata. I see that they have an imaging group in their lineup, so perhaps there will be a biological addition to XMP in the future.

Thanks again for your fantastic work, Phil.

Peter