diff --git a/idl/idl_api.ysl2 b/idl/idl_api.ysl2
index cf374c8..a909e7d 100644
--- a/idl/idl_api.ysl2
+++ b/idl/idl_api.ysl2
@@ -2,18 +2,18 @@
 // stdlib candidates
 // ----------------------------------------------------------------------
 def "func:autocomma" {
-  result if "position()!=last()" > ,
+    result if "position()!=last()" > ,
 }
 
 def "func:exists" {
-  param "xpath";
+    param "xpath";
 
-  choose {
-    when "$xpath"
-        result "true()";
-    otherwise
-        result "false()";
-  }
+    choose {
+        when "$xpath"
+            result "true()";
+        otherwise
+            result "false()";
+    }
 }
 
 // ----------------------------------------------------------------------