Missing main tag

meta {
    title: "Missing main tag";
    version: "1.1_2024-10-14";
    author: "CjMalone";
    link: "https://josm.openstreetmap.de/wiki/Rules/MissingMain";
    baselanguage: "en";
}

*[trade][shop!=trade] {
    throwWarning: "trade=* should be accompanied by shop=trade. One of these is probably out of date.";
}

Rules_MissingMain.validator.mapcss, Rules_MissingMain.zip