Editing OPML (section)

==Criticism==
{{more citations needed|date=December 2013}}
# The [[RFC 822]] date format is considered obsolete, and amongst other things permits the representation of years as two digits. (RFC 822 has been superseded by [[RFC 2822]] then [[RFC 5322]].) In general, date and time formats should be represented according to [[RFC 3339]].
# Due to the semantics of the "expansionState" attribute:
#* The expansion state of the children of collapsed nodes cannot be stored
#* When an outline element is expanded, collapsed, added, deleted or moved, the expansion state of all elements below it must be recalculated
# Due to the arbitrary nature of the "type" attribute, and the acceptance of arbitrary attributes on "outline" elements, interoperability of OPML documents relies almost entirely on the undocumented conventions of content producers.
# MIME types aren't clear; text/xml usually merely identifies the document as having XML content, while text/x-opml does not specify that the document is XML since it lacks the [[+xml]] suffix.
<ref>{{cite web |title=RFC 5322 |url=https://www.rfc-editor.org/rfc/rfc5322 |website=RFC editor |access-date=21 September 2023 |ref=a}}</ref>