diff --git a/inc/CalDAVRequest.php b/inc/CalDAVRequest.php
index 123432a0..2d152f09 100644
--- a/inc/CalDAVRequest.php
+++ b/inc/CalDAVRequest.php
@@ -682,6 +682,15 @@ EOSQL;
   }
 
 
+  /**
+  * Returns true if the URL referenced by this request points at a calendar collection.
+  */
+  function IsCalendar( ) {
+    if ( !$this->IsCollection() ) return false;
+    return $this->collection->is_calendar;
+  }
+
+
   /**
   * Returns true if the URL referenced by this request points at a principal.
   */