Originally a thought: https://bsky.app/profile/did:plc:rkm6m4dsc4da2yzdlvxorhf3/post/3mlonibvvqs2h.
As we think about syndication via both atproto methods (standard.site records) and through classic RSS, it seems relevant to be able to understand that a given feed is accessible via another subscription method. For example, if I am a consumer of an RSS feed, it would be helpful to know the corresponding standard.site document and publication URIs. This information could be used to deduplicate subscriptions that are made with both standard.site and RSS, or to show additional information about an entry/publisher in a feed reader.
We can make use of namespaced RSS extensions to add additional metadata to RSS feeds. https://www.disobey.com/detergent/2002/extendingrss2/, though old, seems to be the best explanation of this.
<rss version="2.0"
xmlns:standardSite="https://standard.site/standardSiteModule">
<channel>
<!-- ... -->
<standardSite:publicationUri>at://did:plc:cbkjy5n7bk3ax2wplmtjofq2/site.standard.publication/3lqpqvbdoas2z</standardSite:publicationUri>
</channel>
</rss>
This example shows how we can specify a namespace for standard.site, and then use that namespace to store the publication URI. We can similarly use <standardSite:documentUri> (e.g. <standardSite:documentUri>at://did:plc:fpruhuo22xkm5o7ttr2ktxdo/site.standard.document/3mjfjsk24qk2i</standardSite:documentUri>) for each entry item.