template_custom-full-width.php

<?php

/* Template Name: Example Template */

add_filter( 'genesis_attr_site-inner', 'sk_attributes_site_inner' );
/**
 * Add attributes for site-inner element.
 *
 * @since 2.0.0
 *
 * @param array $attributes Existing attributes.
 *
 * @return array Amended attributes.
 */
function sk_attributes_site_inner( $attributes ) {

	$attributes['role']     = 'main';
	$attributes['itemprop'] = 'mainContentOfPage';

	return $attributes;

}

// Remove div.site-inner's div.wrap
add_filter( 'genesis_structural_wrap-site-inner', '__return_empty_string' );

// Display header
get_header();

// Content
echo 'Hello World';

// Display Footer
get_footer();