I am building a store using the Shopp plugin, and I noticed that there are possibilities for duplicate content issues:
- A product can be accessed both by
/shop/{productID}and/shop/{product-slug} - A tag can be accessed using
/shop/?shopp_tag={tag-uri}and/shop/tag/{tag-slug} - A tag can be accessed using
/shop/?shopp_category={category-id}and/shop/{category-uri}
Should Google somehow find it’s way into indexing these pages, the value of the identical indexed pages may drop. Canonical tags aim to remedy this situation, and are implemented by the hugely popular and awesome All in One SEO Pack plugin (see my other SEO tips regarding AIOSEO Pack plugin).
The Shopp plugin does not feature canonical tag support, so here’s a modification you can make that will add support for it without changing any core files in All in One SEO Pack, or in Shopp.
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