Returning multiple values

Dictionary<int, Collection<Rectangle>> GetDocumentCoordinates(int DocumentId)

Dictionary<int, PageInfo> GetDocumentAttributes(int DocumentId)

Dictionary<int, Collection<Rectangle>> GetCoordinates(int DocumentId, ref Dictionary<int, PageInfo> PageAttributes)

class DocumentInfo
{
    Dictionary<int, Collection<Rectangle>> Coordinates { get; set;}
    Dictionary<int, PageInfo> PageAttributes { get; set; }
}

DocumentInfo GetDocumentInfo(int DocumentId);

class DocumentInfo {
    Dictionary<int, Collection<Rectangle>> rectangles = ...
    public Collection<Rectangle> GetRectangles(int index) {
        return rectangles[index]; // might want to clone to
                                  // protect against mutation
    }
    Dictionary<int, PageInfo> pages = ...
    public PageInfo GetPageInfo(int index) {
        return pages[index];
    }

 }