parser: properly support tag subtrees instead of text content for article content

classes/feeditem/common.php

@@ -70,6 +70,17 @@ abstract class FeedItem_Common extends FeedItem {
 		}
 	}
 
+	function count_children($node) {
+		return $node->getElementsByTagName("*")->length;
+	}
+
+	function subtree_or_text($node) {
+		if ($this->count_children($node) == 0) {
+			return $node->nodeValue;
+		} else {
+			return $node->c14n();
+		}
+	}
 
 }
 ?>