Значение maxOccurs для элемента, объявленного на верхнем уровне схемы, не может превышать 1. Укажите оболочечный элемент для '<var>X</var>', используя XmlArray или XmlArrayItem вместо XmlElementAttribute, либо используя стиль параметра Wrapped.

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An element declared at the top level of a schema cannot have maxOccurs > 1. Provide a wrapper element for '<var>X</var>' by using XmlArray or XmlArrayItem instead of XmlElementAttribute, or by using the Wrapped parameter style.

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