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$myquery['tax_query'] = array( ‘relation’ => ‘OR’, array( ‘taxonomy’ => ‘category’, ‘terms’ => array(‘cat1′), ‘field’ => ‘slug’, ), array( ‘taxonomy’ => ‘post_tag’, ‘terms’ => array(‘tag1′), ‘field’ => ‘slug’, ), ); query_posts($myquery);

$myquery['tax_query'] = array( array( ‘taxonomy’ => ‘category’, ‘terms’ => array(‘cat1′, ‘cat2′), ‘field’ => ‘slug’, ‘operator’ => ‘NOT IN’, ), ); query_posts($myquery);

$myquery['tax_query'] = array( array( ‘taxonomy’ => ‘category’, ‘terms’ => array(‘category1′), ‘field’ => ‘slug’, ), array( ‘taxonomy’ => ‘post_tag’, ‘terms’ => array(‘tag1′), ‘field’ => ‘slug’, ), ); query_posts($myquery);