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diff --git a/src/org/z3950/zing/cql/Modifier.java b/src/org/z3950/zing/cql/Modifier.java
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+// $Id: Modifier.java,v 1.1 2007-06-27 17:01:23 mike Exp $
+
+package org.z3950.zing.cql;
+import java.util.Vector;
+import java.lang.StringBuffer;
+
+/**
+ * Represents a single modifier, consisting of three elements: a type,
+ * a comparision and a value.  For example, "distance", "<", "3".  The
+ * type is mandatory; either the comparison and value must both occur,
+ * or neither must.
+ * <P>
+ * This class is used only by ModifierSet.
+ *
+ * @version $Id: Modifier.java,v 1.1 2007-06-27 17:01:23 mike Exp $
+ */
+public class Modifier {
+    String type;
+    String comparison;
+    String value;
+
+    /**
+     * Creates a new Modifier with the specified type, comparison
+     * and value.
+     */
+    public Modifier(String type, String comparison, String value) {
+       this.type = type;
+       this.comparison = comparison;
+       this.value = value;
+    }
+
+    /**
+     * Creates a new Modifier with the specified value but no
+     * comparison or value.
+     */
+    public Modifier(String value) {
+       this.value = value;
+    }
+
+    /**
+     * Returns the type with which the Modifier was created.
+     */
+    public String getType() {
+       return type;
+    }
+
+    /**
+     * Returns the comparison with which the Modifier was created.
+     */
+    public String getComparison() {
+       return comparison;
+    }
+
+    /**
+     * Returns the value with which the Modifier was created.
+     */
+    public String getValue() {
+       return value;
+    }
+
+    public String toXCQL(int level, String relationElement) {
+       StringBuffer buf = new StringBuffer();
+
+       buf.append(Utils.indent(level) + "<modifier>\n");
+       buf.append(Utils.indent(level+1) +
+                  "<type>" + Utils.xq(type) + "</type>\n");
+       if (value != null) {
+           buf.append(Utils.indent(level+1) + "<" + relationElement + ">" +
+                      Utils.xq(comparison) + "</" + relationElement + ">\n");
+           buf.append(Utils.indent(level+1) +
+                      "<value>" + Utils.xq(value) + "</value>\n");
+       }
+       
+       buf.append(Utils.indent(level) + "</modifier>\n");
+       return buf.toString();
+    }
+
+    public String toCQL() {
+       StringBuffer buf = new StringBuffer(type);
+
+       if (value != null)
+           buf.append(" " + comparison + " " + value);
+
+       return buf.toString();
+    }
+}