Dokumenti

// WP_Query arguments
$args = array(
	'post_type'              => array( 'dokumenti' ),
	'nopaging'               => false,
	'posts_per_page'         => '15',
	'meta_query'             => array(
		'relation' => 'AND',
		array(
			'key'     => 'kategorija',
			'value'   => 'da_kat_val',
			'compare' => '=',
			'type'    => 'CHAR',
		),
	),
);

// The Query
$dokumenti = new WP_Query( $args );

// The Loop
if ( $dokumenti->have_posts() ) {
	while ( $dokumenti->have_posts() ) {
		$dokumenti->the_post();
		// do something
	}
} else {
	// no posts found
}

// Restore original Post Data
wp_reset_postdata();