diff --git a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/trace/Alias.java b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/trace/Alias.java
index e417738..8beca16 100644
--- a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/trace/Alias.java
+++ b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/trace/Alias.java
@@ -26,7 +26,9 @@
 	private int occurrenceExp;
 	public static final int OCCURRENCE_EXP_CONTAINER = 0;
 	public static final int OCCURRENCE_EXP_RECEIVER = 0;
-	public static final int OCCURRENCE_EXP_FIELD = 1;	
+	public static final int OCCURRENCE_EXP_FIELD = 1;
+	public static final int OCCURRENCE_EXP_ARRAY = 1;
+	public static final int OCCURRENCE_EXP_FIRST_ARG = 1;
 	public static final int OCCURRENCE_EXP_RETURN = -1;
 	
 	public Alias(String objectId, TracePoint occurrencePoint, int occurrenceExp) {