// Convert to PNG by
// dot -Tpng input_data_graph.dot -o input_data_graph.png

digraph {
    SourceRoot
    SourceRootId
    ProjectData
    ProjectId
    AppData
    FileId

    SourceRootId -> AppData    [label = "SourceDatabase\n::app_data"]
    ProjectId -> ProjectData   [label = "SourceDatabase\n::project_data" ]

    AppData -> ProjectId       [label = "<<contains>>"]

    FileId       -> String        [label = "SourceDatabaseExt\n::file_text"]
    FileId       -> SourceRootId  [label = "SourceDatabaseExt\n::file_source_root"]
    SourceRootId -> SourceRoot    [label = "SourceDatabaseExt\n::source_root"]
}