X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FElement.java;h=7eb6a59b53f170689fdc395a8fae574165d38008;hp=4ccde61eb49ecb9cf23c164c9f013cb5c7c8a0ce;hb=2c1c0293545f3d12c23220fd05c663e6aa3f3de1;hpb=0e17670bcfa7b0fe8eb3a2cac81f4b080a09fc98

diff --git a/src/edu/berkeley/sbp/Element.java b/src/edu/berkeley/sbp/Element.java
index 4ccde61..7eb6a59 100644
--- a/src/edu/berkeley/sbp/Element.java
+++ b/src/edu/berkeley/sbp/Element.java
@@ -8,7 +8,7 @@ import java.lang.reflect.*;
 import java.lang.ref.*;
 
 /** <font color=green>the root superclass for all components of the grammar (terminals, nonterminals, literals, etc)</font> */
-public abstract class Element {
+public abstract class Element implements SequenceOrElement {
 
     /** sorry, you can't make up new, custom elements */
     Element() { }
@@ -16,6 +16,6 @@ public abstract class Element {
     abstract StringBuffer toString(StringBuffer sb);
 
     /** returns the Forest resulting from matching this element against the empty string */
-    Forest epsilonForm() { throw new Error("element " + this + " has no epsilon form"); }
+    Forest<?> epsilonForm() { throw new Error("element " + this + " has no epsilon form"); }
 
 }