Source

File: wp-includes/rss.php

function append_content($text) {
		if ( $this->initem ) {
			$this->concat( $this->current_item[ $this->incontent ], $text );
		}
		elseif ( $this->inchannel ) {
			$this->concat( $this->channel[ $this->incontent ], $text );
		}
	}