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--- a/src/common/rclconfig.cpp
+++ b/src/common/rclconfig.cpp
@@ -671,6 +671,17 @@
 		 fld.c_str()));
 	return false;
     }
+}
+
+set<string> RclConfig::getIndexedFields()
+{
+    set<string> flds;
+    if (m_fields == 0)
+	return flds;
+
+    list<string> sl = m_fields->getNames("prefixes");
+    flds.insert(sl.begin(), sl.end());
+    return flds;
 }
 
 // Return specialisations of field name for search expansion