If you want to modify the nav menu structure or make custom menu structure in WordPress then add this code to functions.php file.
class Nav_Walker_Nav_Menu_sitemap extends Walker_Nav_Menu{ function start_el(&$output, $item, $depth = 0, $args = array(), $id = 0){ global $wp_query; $indent = ( $depth ) ? str_repeat( "\t", $depth ) : ''; $class_names = $value = ''; $classes = empty( $item->classes ) ? array() : (array) $item->classes; $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) ); $class_names = ' class="'. esc_attr( $class_names ) . '"'; $output .= $indent . '
then declare the menu with new class like below example in your theme page.
wp_nav_menu( array( 'theme_location' => 'sitemapmainpart', 'walker' => new Nav_Walker_Nav_Menu_sitemap() ) );
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