`pyssg.plugins.taxonomy`

Taxonomy plugin: tags + categories, zero-config.

A taxonomy is a named classification dimension; tag and category are two built-in instances of one mechanism, so adding another dimension is configuration, not engine code. During evaluate_collections it reads the relevant frontmatter keys from every document, builds each term's member list, and materializes virtual pages: a term page per term (/tags/<term>/, /categories/<a>/<b>/) and an index page per taxonomy (/tags/). Categories are hierarchical: category: a/b makes the document a member of both a and a/b.

Incremental: term pages are recomputed deterministically each finalize, so adding/removing a term adds/removes the right page (the engine's page-set diff cleans vanished outputs) and a term page re-emits only when its membership actually changes (render cache + emit cutoff).

`class Taxonomy`

One classification dimension.

`tag() -> Taxonomy`

`category() -> Taxonomy`

`build_taxonomies(build: Build, taxonomies: list[Taxonomy]) -> None`

`class TaxonomyPlugin`

Built-in taxonomies; defaults to tag + category.

`TaxonomyPlugin.apply(self, builder: Builder) -> None`

`taxonomy(*taxonomies: Taxonomy) -> TaxonomyPlugin`

Factory. No args -> tag + category zero-config.