school_schedule = <
    lesson_times = <08:30:00, 09:30:00, 10:30:00, ...>

    locations = <
        [1] = <"under the big plane tree">
        [2] = <"under the north arch">
        [3] = <"in a garden">
    >
     
    subjects = <
        ["philosophy:plato"] = < -- note construction of key
            name = <"philosophy">
            teacher = <"plato">
            topics = <"meta-physics", "natural science">
            weighting = <76%>
        >
        ["philosophy:kant"] = <
            name = <"philosophy">
            teacher = <"kant">
            topics = <"meaning and reason", "meta-physics", "ethics">
            weighting = <80%>
        >
        ["art"] = <
            name = <"art">
            teacher = <"goya">
            topics = <"technique", "portraiture", "satire">
            weighting = <78%>
        >
    >
>