a.json

{
    "RETURN": [
        "DISTINCT",
        "*"
    ],
    "TRIPLES": {
        "T1": {
            "label": "ROOT__projects",
            "projects__project_details": "T1_project_details",
            "projects__project_id": "T1_project_id"
        }
    },
    "WHERE": [
        ["T1_project_id", "not in", "T22_project_id"],
        ["T1_project_details", "not in", "T22_project_details"],
        {
            "sPREFIX": {},
            "RETURN": ["T22_project_id"],
            "TRIPLES": {"T22": {"label": "ROOT__project_outcomes",
                                "project_outcomes__project_id": "T22_project_id"
                               }
            },
            "WHERE": [],
            "vars": [
                "T22_project_id",
                "T22"
            ],
            "aggregates": {},
            "AS": {},
            "prefixed": [
                "project_outcomes__project_id",
                "ROOT__project_outcomes"
            ],
            "GROUP BY": [],
            "ORDER BY": {},
            "LIMIT": null,
            "OFFSET": null,
            "HAVING": []
        }
    ],
    "vars": [
        "T1",
        "T22_project_details",
        "T22_project_id",
        "T1_project_details",
        "T1_project_id"
    ],
    "aggregates": {},
    "AS": {},
    "prefixed": [
        "ROOT__projects",
        "projects__project_details",
        "projects__project_id"
    ],
    "GROUP BY": [],
    "ORDER BY": {},
    "LIMIT": null,
    "OFFSET": null,
    "HAVING": []
}