Example 4: Nested Groups with Attributes

Complex hierarchical structure with styling:

vgraph research_project: IBIS "Research Project" {
    rankdir: LR;

    group phase1 "Discovery Phase" {
        style: filled;
        color: lightyellow;

        node q1: Question "What should we research?" [fontsize: 16];
        node a1: Answer "User behavior" [fontsize: 14];
        node a2: Answer "Market trends" [fontsize: 14];

        group methods "Research Methods" {
            style: dashed;
            color: orange;

            node pro1: Pro "Interviews provide depth" [fontsize: 12];
            node pro2: Pro "Surveys give breadth" [fontsize: 12];
            node con1: Con "Time consuming" [fontsize: 12];
        };

        edge q1 -> a1;
        edge q1 -> a2;
        edge a1 -> pro1: supports;
        edge a1 -> con1: objects_to;
    };

    group phase2 "Analysis Phase" {
        style: filled;
        color: lightblue;

        node q2: Question "How to analyze data?" [fontsize: 16];
        node a3: Answer "Quantitative analysis" [fontsize: 14];
    };
}