{

    'text'    : ['is', 'begins', 'contains', 'ends'], // could have "in" and "not in"

    'number'  : ['=', 'between', '>', '<', '>=', '<='],

    'date'    : ['is', 'between', { oper: 'less', text: 'before'}, { oper: 'more', text: 'after' }],

    'list'    : ['is'],

    'hex'     : ['is', 'between'],

    'color'   : ['is', 'begins', 'contains', 'ends'],

    'enum'    : ['in', 'not in']

}

​