The `XElement.GetRequiredAttributeValue` method is a part of the `System.Xml.Linq` namespace in C#. It is used to retrieve a required attribute value from an XML element. This method takes the name of the attribute as a parameter and returns its value if found. If the attribute is not found, it throws an `InvalidOperationException`. This method is useful when there is a need to ensure the presence of a specific attribute in an XML element and retrieve its value for further processing.
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