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Currently I am facing issue with my blog feed. Although my RSS Feeds are valid but there is some inter operability error. That’s what https://validator.w3.org/ suggested me.
This feed is valid, but interoperability with the widest range of feed readers could be improved by implementing the following recommendations.
line 20, column 0: Use of unknown namespace: com-wordpress:feed-additions:1 (10 occurrences) [help]
<site xmlns=”com-wordpress:feed-additions:1″>64699410</site> <item>
Source: https://technosamigos.com/feed/