public interface Graph<T> {
    void addAttributeNodes(String ... attributeName);
    void addAttributeNodes(Attribute<T, ?> ... attribute);
    <X> Subgraph<X> addSubgraph(Attribute<T, X> attribute);
    <X> Subgraph<? extends X> addSubgraph(Attribute<T, X> attribute, Class<? extends X> type);
    <X> Subgraph<X> addSubgraph(String attributeName);
    <X> Subgraph<X> addSubgraph(String attributeName, Class<X> type);
    <X> Subgraph<X> addKeySubgraph(Attribute<T, X> attribute);
    <X> Subgraph<? extends X> addKeySubgraph(Attribute<T, X> attribute, Class<? extends X> type);
    <X> Subgraph<X> addKeySubgraph(String attributeName);
    <X> Subgraph<X> addKeySubgraph(String attributeName, Class<X> type);
    List<AttributeNode<?>> getAttributeNodes();
}

public interface EntityGraph<T> extends Graph<T> {
    String getName();
    <T> Subgraph<? extends T> addSubclassSubgraph(Class<? extends T> type);
}

public interface Subgraph<T> extends Graph<T> {
    Class<T> getClassType();
}