make ITxGenerator as stream

plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveform.java

@@ -26,6 +26,8 @@ public interface IWaveform extends IHierNode {
 	
 	public WaveformType getType();
 	
+	public String getKind();
+	
 	public int getWidth();
 
 }

plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/tx/ITxGenerator.java

@@ -12,8 +12,8 @@ package com.minres.scviewer.database.tx;
 
 import com.minres.scviewer.database.IWaveform;
 
-public interface ITxGenerator {
-	public Long getId();
+public interface ITxGenerator extends IWaveform {
+
 	public IWaveform getStream();
-	public String getName();
+
 }