{
    "classifications": [
        {
            "column": "name",
            "role": "attribute",
            "confidence": 0.8,
            "reason": "Player name, unique per row, descriptive text displayed rather than grouped or aggregated (could act as a row identifier, but it is a name)."
        },
        {
            "column": "number_of_matches",
            "role": "measure",
            "confidence": 0.95,
            "reason": "Numeric count of matches played, suitable for sum/avg aggregation."
        },
        {
            "column": "playing_years",
            "role": "attribute",
            "confidence": 0.8,
            "reason": "Long free-form list of years stored as text; high cardinality and displayed rather than grouped or aggregated."
        }
    ]
}