Google Product Taxonomy — provenance and licensing
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File: taxonomy-with-ids.en-US.txt
Taxonomy version: 2021-09-21 (recorded in the file's own header line)
Source: https://www.google.com/basepages/producttype/taxonomy-with-ids.en-US.txt
Published by Google as part of the Merchant Center product data
specification: https://support.google.com/merchants/answer/1705911

Why it ships with the plugin
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The `google_product_category` attribute must match Google's taxonomy
verbatim, or Merchant Center rejects the product with an "Invalid product
category" error. The plugin bundles the official list so the category
mapping screen can search it offline and validate saved values without
making any external HTTP request at runtime.

Licensing
---------
The file is a plain list of category identifiers and their names — factual
reference data, containing no code and no creative expression. Google
publishes it openly for merchants and feed tools to use when populating
product data, and it is redistributed here unmodified with its original
version header intact.

Nothing in this file restricts redistribution, so it imposes no condition
that conflicts with the plugin's GPLv2-or-later licence, and the packaged
plugin as a whole is distributed under that licence.

Updating
--------
Replace the file with a fresh download from the URL above. The parser
(includes/Channels/Google/GoogleTaxonomy.php) ignores comment lines
beginning with "#" and reads "<id> - <full > category > path>" lines, so a
newer official file is a drop-in replacement. Sites needing a localized
taxonomy can return their own list from the `apfw_google_taxonomy` filter.
