public Document(string contents)
: this()
{
IRevision intialRevision = new InitialRevision(contents);
CurrentRevision = intialRevision;
_revisionMap.Add(intialRevision.Id, Tuple.Create(intialRevision, RevisionStatus.Applied));
}
public Document()
{
CurrentRevision = new InitialRevision();
Subcribers = new List<Subscriber>();
}