--- a/src/java/de/intevation/mxd/writer/MapScriptWriter.java	Fri Jun 17 14:32:17 2011 +0200
+++ b/src/java/de/intevation/mxd/writer/MapScriptWriter.java	Fri Jun 17 18:22:40 2011 +0200
@@ -219,14 +219,18 @@
             if(classElement.hasAttribute("field_count")) {
                 int count =
                     Integer.parseInt(classElement.getAttribute("field_count"));
-                String exp = "";
-                for(int j = 0; j < count; j++) {
-                    //TODO Find a way to create Expressions.
-                    exp = "([" + classElement.getAttribute("expression_field_" + j);
-                    exp += "] " + classElement.getAttribute("expression_operator");
-                    exp += " " + classElement.getAttribute("value") + ")";
+                int type = 0;
+                try {
+                    Double.parseDouble(classElement.getAttribute("value"));
+                    type = 1;
                 }
-                co.setExpression(exp);
+                catch(Exception e) {
+                    type = 2;
+                    logger.info("not a double");
+                }
+                if (type == 1) {
+                    co.setExpression(createDoubleExpression(classElement, count));
+                }
             }
             //Write symbols and styles.
             NodeList l = classElement.getChildNodes();
@@ -249,5 +253,49 @@
             }
         }
     }
+
+    private String createDoubleExpression (Element classElement, int count) {
+        String exp = "";
+        String op = classElement.getAttribute("expression_operator");
+        String op1 = "";
+        String op2 = "";
+        if (op.equals("<=")) {
+            op1 = ">=";
+            op2 = op;
+            for(int j = 0; j < count; j++) {
+                if (classElement.getAttribute("min_value").equals(
+                    classElement.getAttribute("value"))) {
+                    exp = "([" +
+                          classElement.getAttribute(
+                              "expression_field_" + j) +
+                          "] == " +
+                          classElement.getAttribute("value") +
+                          ")";
+                }
+                else {
+                    exp = "([";
+                    exp += classElement.getAttribute(
+                                "expression_field_" + j);
+                    exp += "] " + op1;
+                    exp += " " + classElement.getAttribute("min_value");
+                    exp += " AND [" + classElement.getAttribute(
+                            "expression_field_" + j);
+                    exp += "] " + op2 + " ";
+                    exp += classElement.getAttribute("value");
+                    exp += ")";
+                }
+            }
+        }
+        else if (op.equals("==")) {
+            op1 = op;
+            for(int j = 0; j < count; j++) {
+               exp = "([" +
+                     classElement.getAttribute("expression_field_" + j) +
+                     "] == " +
+                     classElement.getAttribute("value") + ")";
+            }
+        }
+        return exp;
+    }
 }