X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FElement.java;h=5f55be697e74ed325aa9cc2d4c83b3f2aefc7ecc;hp=b199a23ca52f943964a5afb2a9002e94f42a54d4;hb=87f214f3da9f43c3ab93923313845c372f9a96be;hpb=0a0227b9180534d2a431f3d6e08a398bde2244c4

diff --git a/src/edu/berkeley/sbp/Element.java b/src/edu/berkeley/sbp/Element.java
index b199a23..5f55be6 100644
--- a/src/edu/berkeley/sbp/Element.java
+++ b/src/edu/berkeley/sbp/Element.java
@@ -13,6 +13,7 @@ public abstract class Element {
     /** add all positions reachable from the start of this Element to @rp */
     abstract void reachable(HashSet<Sequence.Position> rp);
 
+    abstract Topology toAtom();
     Forest epsilonForm() { throw new Error("no epsilon form: " + this); }
     final boolean possiblyEpsilon(Walk.Cache cache)   {
         Boolean ret = cache==null ? null : cache.possiblyEpsilon.get(this);