+ * XML callback function for the start of a new XML tag.
+ *
+ * @since 0.71
+ * @access private
+ *
+ * @uses $updated_timestamp Not used inside function.
+ * @uses $all_links Not used inside function.
+ * @uses $map Stores names of attributes to use.
+ * @global array $names
+ * @global array $urls
+ * @global array $targets
+ * @global array $descriptions
+ * @global array $feeds
+ *
+ * @param mixed $parser XML Parser resource.
+ * @param string $tagName XML element name.
+ * @param array $attrs XML element attributes.
+ */