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SIMPLEPIE_TYPE_NONE Unknown.
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SIMPLEPIE_TYPE_RSS_090 RSS 0.90.
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SIMPLEPIE_TYPE_RSS_091_NETSCAPE RSS 0.91 (Netscape).
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SIMPLEPIE_TYPE_RSS_091_USERLAND RSS 0.91 (Userland).
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SIMPLEPIE_TYPE_RSS_091 RSS 0.91.
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SIMPLEPIE_TYPE_RSS_092 RSS 0.92.
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SIMPLEPIE_TYPE_RSS_093 RSS 0.93.
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SIMPLEPIE_TYPE_RSS_094 RSS 0.94.
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SIMPLEPIE_TYPE_RSS_10 RSS 1.0.
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SIMPLEPIE_TYPE_RSS_20 RSS 2.0.x.
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SIMPLEPIE_TYPE_RSS_RDF RDF-based RSS.
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SIMPLEPIE_TYPE_RSS_SYNDICATION Non-RDF-based RSS (truly intended as syndication format).
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SIMPLEPIE_TYPE_RSS_ALL Any version of RSS.
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SIMPLEPIE_TYPE_ATOM_03 Atom 0.3.
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SIMPLEPIE_TYPE_ATOM_10 Atom 1.0.
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SIMPLEPIE_TYPE_ATOM_ALL Any version of Atom.
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SIMPLEPIE_TYPE_ALL Any known/supported feed type.