KeyInfo containing the specified list of key information types.
@param content a list of one or more {@link XMLStructure}s representing key information types. The list is defensively copied to protect against subsequent modification.
@return a KeyInfo
@throws NullPointerException if content is null
@throws IllegalArgumentException if content is empty
@throws ClassCastException if content contains any entriesthat are not of type {@link XMLStructure}
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