WordPress at a glance
filter is not described

the_excerpt_rss filter-hook . WP 1.2.0

Filters the post excerpt for a feed.

Usage

add_filter( 'the_excerpt_rss', 'filter_function_name_9052' );
function filter_function_name_9052( $output ){
	// filter...

	return $output;
}
$output(string)
The current post excerpt.

Where the hook is called

the_excerpt_rss()
wp-includes/feed.php 229
echo apply_filters( 'the_excerpt_rss', $output );

Where the hook is used (in WP core)

wp-includes/default-filters.php 208
add_filter( 'the_excerpt_rss', 'convert_chars' );
wp-includes/default-filters.php 209
add_filter( 'the_excerpt_rss', 'ent2ncr', 8 );