/// <summary>
/// Add a key to the persistence store index
/// </summary>
/// <param name="Index">Index to add key to</param>
/// <param name="Data">Data to add.</param>
public void AddKey(PersistenceIndex Index, string Data) {
if (Keys == null) Keys = new List<IndexTerm>();
var IndexTerm = new IndexTermExtended(Index, Data);
Keys.Add(IndexTerm);
}
