extract, store and propagate "category" information
these are tags
<item>
<title>drep - a grep with runtime reloadable filters</title>
<link>https://github.com/maxpert/drep</link>
<guid isPermaLink="false">https://lobste.rs/s/ofcsks</guid>
<author>mxp@users.lobste.rs (mxp)</author>
<pubDate>Sun, 28 Jun 2020 11:04:39 -0500</pubDate>
<comments>https://lobste.rs/s/ofcsks/drep_grep_with_runtime_reloadable</comments>
<description><p><a href="https://lobste.rs/s/ofcsks/drep_grep_with_runtime_reloadable">Comments</a></p></description>
<category>programming</category>
<category>rust</category>
</item>
could be used for filtering such as "exclude ask category".