В соответствии со спецификацией Atom10 "<var>X</var>" должен иметь одно из следующих значений: "text", "html", "xhtml", однако в десериализуемом документе имеет значение "<var>Y</var>".

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The Atom10 specification requires '<var>X</var>' to have one of these values: "text", "html", "xhtml", however this value is '<var>Y</var>' in the document being deserialized.

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