2021-09-22 UTC
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[tantek] Atom OTOH does allow for relative URLs, supported by the xml:base attribute per: "Any element defined by this specification MAY have an xml:base attribute [W3C.REC-xmlbase-20010627]. When xml:base is used in an Atom Document, it serves the function described in section 5.1.1 of [RFC3986], establishing the base URI (or IRI) for resolving any relative references found within the effective scope of the xml:base attribute."