diff --git a/src/simplexml_tree.php b/src/simplexml_tree.php
index 094e612..518fe31 100644
--- a/src/simplexml_tree.php
+++ b/src/simplexml_tree.php
@@ -158,13 +158,15 @@ function _simplexml_tree_recursively_process_node($item, $depth, $include_string
 		
 		// If things are in the current namespace, display them a bit differently
 		$is_current_namespace = ( $ns_uri == reset($item_ns) );
-		
+
+		$ns_uri_quoted = (strlen($ns_uri) == 0 ? 'null' : "'$ns_uri'");
+
 		if ( count($attributes) > 0 )
 		{
 			if ( ! $is_current_namespace )
 			{
 				$dump .= str_repeat($indent, $depth)
-					. "->attributes('$ns_alias', true)" . PHP_EOL;
+					. "->attributes($ns_uri_quoted)" . PHP_EOL;
 			}
 			
 			foreach ( $attributes as $sx_attribute )
@@ -219,7 +221,7 @@ function _simplexml_tree_recursively_process_node($item, $depth, $include_string
 			else
 			{
 				$dump .= str_repeat($indent, $depth)
-					. "->children('$ns_alias', true)" . PHP_EOL;
+					. "->children($ns_uri_quoted)" . PHP_EOL;
 				$display_depth = $depth + 1;
 			}
 			
diff --git a/tests/tree-output/basic-default-ns b/tests/tree-output/basic-default-ns
index dc26004..67aa4c3 100644
--- a/tests/tree-output/basic-default-ns
+++ b/tests/tree-output/basic-default-ns
@@ -1,6 +1,6 @@
 SimpleXML object (1 item)
 [0] // <movies>
-	->children('', true)
+	->children('https://github.com/IMSoP/simplexml_debug')
 		->movie[0]
 			->title[0]
 			->characters[0]
diff --git a/tests/tree-output/basic-ns b/tests/tree-output/basic-ns
index 46179c3..88518ae 100644
--- a/tests/tree-output/basic-ns
+++ b/tests/tree-output/basic-ns
@@ -1,6 +1,6 @@
 SimpleXML object (1 item)
 [0] // <movies>
-	->children('test', true)
+	->children('https://github.com/IMSoP/simplexml_debug')
 		->movie[0]
 			->title[0]
 			->characters[0]
@@ -14,8 +14,8 @@ SimpleXML object (1 item)
 			->great-lines[0]
 				->line[0]
 			->rating[0]
-				->attributes('', true)
+				->attributes(null)
 					->type
 			->rating[1]
-				->attributes('', true)
+				->attributes(null)
 					->type
diff --git a/tests/tree-output/soap b/tests/tree-output/soap
index d212f00..7819028 100644
--- a/tests/tree-output/soap
+++ b/tests/tree-output/soap
@@ -1,15 +1,15 @@
 SimpleXML object (1 item)
 [0] // <soap:Envelope>
-	->children('soap', true)
+	->children('http://schemas.xmlsoap.org/soap/envelope/')
 		->Header[0]
-			->children('s', true)
+			->children('http://example.org/security')
 				->credentials[0]
-					->children('', true)
+					->children(null)
 						->username[0]
 						->password[0]
 		->Body[0]
-			->children('tns', true)
+			->children('http://example.org/some-soap-service')
 				->DoSomething[0]
-					->children('', true)
+					->children(null)
 						->from[0]
 						->to[0]