/// <summary>
/// Finds the prefix declared for the given namespace URI.
/// </summary>
/// <param name="uri">The namespace to resolve for the prefix.</param>
/// <returns>
/// The matching prefix. If there is no mapped prefix, the method returns String.EmptyFalse. If a null value is supplied, then null is returned.
/// </returns>
public override string LookupPrefix(string uri)
{
return(_baseContext.LookupPrefix(uri));
}