diff -r 2608240fc957 -r c79d31ba84b9 src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/util/DocPaths.java
--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/util/DocPaths.java	Wed Dec 13 21:25:49 2017 +0100
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/util/DocPaths.java	Wed Dec 13 12:45:06 2017 -0800
@@ -62,6 +62,9 @@
     /** The name of the subdirectory for user-provided additional documentation files. */
     public static final DocPath DOC_FILES = DocPath.create("doc-files");
 
+    /** The name of the file for the element list. */
+    public static final DocPath ELEMENT_LIST = DocPath.create("element-list");
+
     /** The name of the image file showing a magnifying glass on the search box. */
     public static final DocPath GLASS_IMG = DocPath.create("glass.png");
 
@@ -149,7 +152,7 @@
     /** The name of the file for the package frame. */
     public static final DocPath PACKAGE_FRAME = DocPath.create("package-frame.html");
 
-    /** The name of the file for the package list. */
+    /** The name of the file for the package list. This is to support the legacy mode. */
     public static final DocPath PACKAGE_LIST = DocPath.create("package-list");
 
     /** The name of the package search index file. */
@@ -182,7 +185,12 @@
 
     /** The name of the file for the module summary. */
     public static DocPath moduleSummary(ModuleElement mdle) {
-        return DocPath.create(mdle.getQualifiedName() + "-summary.html");
+        return DocPaths.moduleSummary(mdle.getQualifiedName().toString());
+    }
+
+    /** The name of the file for the module summary. */
+    public static DocPath moduleSummary(String mdleName) {
+        return DocPath.create(mdleName + "-summary.html");
     }
 
     /** The name of the file for the module frame. */