diff --git a/__while.cpp b/__while.cpp
index fbf7b37..ea7e16b 100644
--- a/__while.cpp
+++ b/__while.cpp
@@ -1,32 +1,56 @@
 #include "__while.h"
 #include "Exception.h"
+#include "Operand.h"
 #include <iostream>
 
 namespace jet {
    
    __while::__while(coreutils::ZString &in, coreutils::MString &parentOut, Global &global, Tag *parent) : Tag(in, parentOut, global, parent) {
 
-      if(variableDefined(coreutils::ZString("value1"))) {	   
-	 if(variableDefined(coreutils::ZString("expr")))
+      coreutils::MString result;
+      bool booleanResult = false;
+      
+      if(variableDefined("value1")) {
+	   
+	 if(variableDefined("expr"))
 	   throw coreutils::Exception("Either value1 or expr can be specified but not both.");
-	 if(variableDefined(coreutils::ZString("value2"))) {
-	    if(variableDefined(coreutils::ZString("type"))) {
-	       // process here
-	    } else
+	 if(variableDefined("value2")) {
+	      
+	    if(variableDefined("type")) {
+	       
+
+	    }
+	    else
 	      throw coreutils::Exception("type expected if value1 and value2 specified.");
-	 } else
+	 }
+	 else
 	   throw coreutils::Exception("value2 required if value1 specified.");
-      } else if(variableDefined(coreutils::ZString("expr"))) {
-	 if(variableDefined(coreutils::ZString("value2")))
+	 if(!variableDefined("type"))
+	   throw coreutils::Exception("type required for a value1 and value2 comparison.");
+	 int rc = variables["value1"].compare(variables["value2"]);
+	 if(((variables["type"] == "eq") && (rc == 0)) ||
+	    ((variables["type"] == "ne") && (rc != 0)) ||
+	    ((variables["type"] == "lt") && (rc == -1)) ||
+	    ((variables["type"] == "le") && (rc != 1)) ||
+	    ((variables["type"] == "gt") && (rc == 1)) ||
+	    ((variables["type"] == "ge") && (rc != -1)))
+	   booleanResult = true;
+	 else
+	   throw coreutils::Exception("type value must be 'eq','ne','lt','le','gt','ge'.");
+      }
+      else if(variableDefined("expr")) {
+	 
+	 if(variableDefined("value2"))
 	   throw coreutils::Exception("value2 should not be specified with expr.");
-	 if(variableDefined(coreutils::ZString("type")))
+	 if(variableDefined("type"))
 	   throw coreutils::Exception("type should not be specified with expr.");
-	 // process here
+	 booleanResult = Operand(variables["expr"]).boolean;
       }
       
-      while(true) {
+      while(booleanResult) {	   
 	 processContainer(container);
-      } 
+	 container.reset();
+      }
          
    }