tax query in wordpress code example

Example: wp tax query

//simple
'tax_query' => array(
    array(
        'taxonomy' => 'people',
        'field'    => 'slug',
        'terms'    => 'bob',
    ),
),

//more complicated
'tax_query' => array(
    'relation' => 'OR',
    array(
        'taxonomy' => 'category',
        'field'    => 'slug',
        'terms'    => array( 'quotes' ),
    ),
    array(
        'relation' => 'AND',
        array(
            'taxonomy' => 'post_format',
            'field'    => 'slug',
            'terms'    => array( 'post-format-quote' ),
        ),
        array(
            'taxonomy' => 'category',
            'field'    => 'slug',
            'terms'    => array( 'wisdom' ),
        ),
    ),
),