The "atom:feed" element is the document (i.e., top-level) element of an Atom Feed Document, acting as a container for metadata and data associated with the feed. Its element children consist of metadata elements followed by zero or more atom:entry child elements. atomFeed = element atom:feed { atomCommonAttributes, (atomAuthor & atomCategory & atomContributor & atomGenerator? & atomIcon? & atomId & atomLink & atomLogo? & atomRights? & atomSubtitle? & atomTitle & atomUpdated & extensionElement*), atomEntry } This specification assigns no significance to the order of atom:entry elements within the feed. The following child elements are defined by this specification (note that the presence of some of these elements is required): o atom:feed elements MUST contain one or more atom:author elements, unless all of the atom:feed element's child atom:entry elements contain at least one atom:author element. o atom:feed elements MAY contain any number of atom:category elements. o atom:feed elements MAY contain any number of atom:contributor elements. o atom:feed elements MUST NOT contain more than one atom:generator element. o atom:feed elements MUST NOT contain more than one atom:icon element. o atom:feed elements MUST NOT contain more than one atom:logo element. o atom:feed elements MUST contain exactly one atom:id element. o atom:feed elements SHOULD contain one atom:link element with a rel attribute value of "self". This is the preferred URI for retrieving Atom Feed Documents representing this Atom feed. o atom:feed elements MUST NOT contain more than one atom:link element with a rel attribute value of "alternate" that has the same combination of type and hreflang attribute values. o atom:feed elements MAY contain additional atom:link elements beyond those described above. o atom:feed elements MUST NOT contain more than one atom:rights element. o atom:feed elements MUST NOT contain more than one atom:subtitle element. o atom:feed elements MUST contain exactly one atom:title element. o atom:feed elements MUST contain exactly one atom:updated element. If multiple atom:entry elements with the same atom:id value appear in an Atom Feed Document, they represent the same entry. Their atom:updated timestamps SHOULD be different. If an Atom Feed Document contains multiple entries with the same atom:id, Atom Processors MAY choose to display all of them or some subset of them. One typical behavior would be to display only the entry with the latest atom:updated timestamp.
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