> **Vendored from upstream**, pinned at SHA `7765fae`. One file lives next to this note:
>
> - `datatypes_conf.xml.sample` — the structured source. **Agents and casting should consume this** when reasoning about the canonical extension set, datatype subclassing, MIME types, auto-decompression (`auto_compressed_types`), per-extension converters, and the global `<sniffer>` order. Sync is manual.
>
> **When to consult:** picking valid `format=` values for tool wrappers (see [[galaxy-xsd]]), choosing output extensions in Molds, mapping Nextflow file types onto Galaxy datatypes, or reasoning about sniff-order ambiguity between related text/tabular formats.