URI запроса недопустим, поскольку сегмент "<var>X</var>" ссылается на одинарный элемент, а сегмент "<var>Y</var>" может следовать только за коллекцией ресурсов.

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Unlocalized message

The request URI is not valid, since the segment '<var>X</var>' refers to a singleton, and the segment '<var>Y</var>' can only follow a resource collection.

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