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' ),
),
),
),