public bool ContainsPrefix(string prefix)
{
return
"contextItem".Equals(prefix, StringComparison.OrdinalIgnoreCase)
|| "renderingItem".Equals(prefix, StringComparison.OrdinalIgnoreCase)
|| "pageContextItem".Equals(prefix, StringComparison.OrdinalIgnoreCase)
|| "dataSource".Equals(prefix, StringComparison.OrdinalIgnoreCase);
}