# Tag-union implementation?

**URL:** <https://meta.discourse.org/t/tag-union-implementation/58121>\
**Category:** Development\
**Created:** [February 28, 2017, 8:20pm UTC](https://meta.discourse.org/t/tag-union-implementation/58121 "2017-02-28T20:20:23Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![attj](https://avatars.discourse-cdn.com/v4/letter/a/a698b9/32.png) [@attj](https://meta.discourse.org/u/attj)\
**Post date:** [August 29, 2022, 1:08pm UTC](https://meta.discourse.org/t/tag-union-implementation/58121/10 "2022-08-29T13:08:46Z")

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> [@david](#):
>
> I just had a quick look at the server-side implementation of the `tags` filter and it looks like we also support a space-separated list.

This is very neat. However, the page does not keep the restrictions when a category is selected from top left. For pages with single tags, this works as expected.

For instance, If I am at /tag/tag1 and pick site-feedback from top left. It shows /tags/c/site-feedback/2/tag1.

With /?tags=tag1+tag2, it just redirects me to /c/site-feedback/2

Is it possible to have this functionality?

I guess this was requested in these two topics as well:

> [@URL syntax for multiple tags within a category](https://meta.discourse.org/t/url-syntax-for-multiple-tags-within-a-category/169972):
>
> It would be nice to be able to filter topics based on multiple tags within a category using the URL syntax currently available for multiple tags filtering: The output page from this URL filtering looks a lot sleeker than the output from an advanced search.

> [@Is it possible to filter a category by multiple tags?](https://meta.discourse.org/t/is-it-possible-to-filter-a-category-by-multiple-tags/145430):
>
> Currently we can do this: [https://meta.discourse.org/c/bug?tags=admin](https://meta.discourse.org/c/bug?tags=admin) But could we do this? [https://meta.discourse.org/c/bug?tags=admin,email](https://meta.discourse.org/c/bug?tags=admin,email) Where it filters topics in that category containing both tags? (If it’s not possible, could it be added please?)

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