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The objective is to fetch fields associated with a specific post id to create a custom rss feed.

It is required to use functions like the_content_feed('rss2') , the_excerpt_rss() etc outside the loop to fill the rss template.

How to accomplish this (use such functions outside the loop)?

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you can create your own custom rss template and create thr loop inside it so you will have easy access to loop only function

take a look at this answer that shows how to create your custom rss How to create additional full text RSS feeds

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