Change attributes for home page content element

functions.php

add_filter( 'genesis_attr_content', 'bp_attributes_content' );
/**
 * Change attributes for home page main content element.
 *
 */
function bp_attributes_content( $attributes ) {

	//* Home page main content microdata
	if ( is_home() ) {
		$attributes['itemtype']  = 'http://schema.org/Blog';
	}

	return $attributes;

}