diff --git a/src/org/zlibrary/core/options/ZLOption.java b/src/org/zlibrary/core/options/ZLOption.java
index ebf912954..b6093efb5 100644
--- a/src/org/zlibrary/core/options/ZLOption.java
+++ b/src/org/zlibrary/core/options/ZLOption.java
@@ -1,6 +1,6 @@
 package org.zlibrary.core.options;
 
-import org.zlibrary.core.options.config.ZLConfig;
+import org.zlibrary.core.options.config.ZLSimpleConfig;
 import org.zlibrary.core.options.config.ZLConfigInstance;
 
 public abstract class ZLOption {
@@ -8,7 +8,7 @@ public abstract class ZLOption {
 	public static final String CONFIG_CATEGORY = "options";
 	public static final String STATE_CATEGORY = "state";
 	
-	protected ZLConfig myConfig = ZLConfigInstance.getInstance();
+	protected ZLSimpleConfig myConfig = ZLConfigInstance.getInstance();
 	protected String myCategory;
 	protected String myGroup;
 	protected String myOptionName;
diff --git a/src/org/zlibrary/core/options/config/ZLConfigImpl.java b/src/org/zlibrary/core/options/config/ZLConfigImpl.java
index 0e89533d9..71543a6d4 100644
--- a/src/org/zlibrary/core/options/config/ZLConfigImpl.java
+++ b/src/org/zlibrary/core/options/config/ZLConfigImpl.java
@@ -1,69 +1,65 @@
 package org.zlibrary.core.options.config;
 
-import java.util.*;
+import java.util.Map;
 
-/**
- * класс Конфиг. это своеобразная структура опций.
- * основное поле myData содержит список групп, которым
- * в качестве ключей сопоставляются их имена.
- * @author Администратор
- *
- */
 /*package*/ class ZLConfigImpl implements ZLConfig {
-	// public abstract void unsetValue(String group, String name);
+	private final ZLSimpleConfigImpl myMainConfig;
+	private final ZLDeltaConfig myDeltaConfig;
 
-	// public abstract  boolean isAutoSavingSupported() const = 0;
-	// public abstract  void startAutoSave(int seconds) = 0;
-	private Map<String, ZLGroup> myData;
-	
-	public ZLConfigImpl (){
-		myData = new LinkedHashMap<String, ZLGroup>();
-	}
-	
-	public Map<String, ZLGroup> getGroups(){
-		return Collections.unmodifiableMap(myData);
-	}
-	
-	public ZLConfigImpl (Map<String, ZLGroup> map){
-		myData = map;
-	}
-	
-	public void removeGroup(String group){
-		if (myData.get(group) != null){
-			myData.remove(group);
-		}
+	public ZLConfigImpl() {
+		myMainConfig = new ZLSimpleConfigImpl();
+		myDeltaConfig = new ZLDeltaConfig();
 	}
 
-	public String getValue(String group, String name, String defaultValue){
-		if (myData.get(group) != null){
-			return myData.get(group).getValue(name, defaultValue);
-		} else{
-			return defaultValue;
-		}
+	public Map<String, ZLGroup> getGroups() {
+		return myMainConfig.getGroups();
 	}
-	
-	public void setValue(String group, String name, String value, String category){
-		if (myData.get(group) != null){
-			myData.get(group).setValue(name, value, category);
+
+	public String getValue(String group, String name, String defaultValue) {
+		String value = myDeltaConfig.getValue(group, name, defaultValue);
+		if (value == null) {
+			return myMainConfig.getValue(group, name, defaultValue);
 		} else {
-			ZLGroup newGroup = new ZLGroup();
-			newGroup.setValue(name, value, category);
-							myData.put(group, newGroup);
+			return value;
 		}
 	}
-	
-	public void unsetValue(String group, String name){
-		myData.get(group).unsetValue(name);
+
+	public void removeGroup(String name) {
+		myDeltaConfig.removeGroup(name);
+	}
+
+	public void setValue(String group, String name, String value, String category) {
+		myDeltaConfig.setValue(group, name, value, category);
+	}
+
+	public void unsetValue(String group, String name) {
+		myDeltaConfig.unsetValue(group, name);
 	}
 	
-	/**
-	 * метод вывода в строку
-	 */
-	public String toString(){
-		StringBuffer sb = new StringBuffer();
-		for (String categoryName : myData.keySet()){
-			sb.append("" + categoryName + "\n\n" + myData.get(categoryName) + "\n");
+	public void clearDelta() {
+		myDeltaConfig.clear();
+	}
+	
+	public void applyDelta() {
+		for (String deletedGroup : myDeltaConfig.getDeletedGroups()) {
+			myMainConfig.removeGroup(deletedGroup);
 		}
-		return sb.toString();
-	}   
+		
+		Map<String, String> deletedValues = myDeltaConfig.getDeletedValues();
+		for (String group : deletedValues.keySet()) {
+			myMainConfig.unsetValue(group, deletedValues.get(group));
+		}
+		
+		ZLSimpleConfigImpl setValues = myDeltaConfig.getSetValues();
+		Map<String, ZLGroup> groups = setValues.getGroups();
+		for (String group : groups.keySet()) {
+			for (ZLOptionValue value : groups.get(group).getValues()) {
+				myMainConfig.setValue(group, value.getName(), 
+						value.getValue(), value.getCategory());
+			}
+		}
+		myDeltaConfig.clear();
+	}
+	
+	
 }
diff --git a/src/org/zlibrary/core/options/config/ZLConfigInstance.java b/src/org/zlibrary/core/options/config/ZLConfigInstance.java
index 0becebc11..5b20f7d11 100644
--- a/src/org/zlibrary/core/options/config/ZLConfigInstance.java
+++ b/src/org/zlibrary/core/options/config/ZLConfigInstance.java
@@ -2,7 +2,7 @@ package org.zlibrary.core.options.config;
 
 public class ZLConfigInstance {
 	
-	private static final ZLConfigImpl myConfig = new ZLConfigImpl();
+	private static final ZLConfig myConfig = new ZLConfigImpl();
 	
 	public static ZLConfig getInstance(){
 		return myConfig;
diff --git a/src/org/zlibrary/core/options/config/ZLDeltaConfig.java b/src/org/zlibrary/core/options/config/ZLDeltaConfig.java
new file mode 100644
index 000000000..e3ab5bdad
--- /dev/null
+++ b/src/org/zlibrary/core/options/config/ZLDeltaConfig.java
@@ -0,0 +1,49 @@
+package org.zlibrary.core.options.config;
+
+import java.util.*;
+
+/*package*/ final class ZLDeltaConfig {
+	
+	private Map<String, String> myDeletedValues = new HashMap<String, String>();
+	private Set<String> myDeletedGroups = new HashSet<String>();
+	private ZLSimpleConfigImpl mySetValues = new ZLSimpleConfigImpl();
+	
+	public ZLDeltaConfig() {
+	}
+	
+	public Set<String> getDeletedGroups() {
+		return Collections.unmodifiableSet(myDeletedGroups);
+	}
+	
+	public Map<String, String> getDeletedValues() {
+		return Collections.unmodifiableMap(myDeletedValues);
+	}
+	
+	public ZLSimpleConfigImpl getSetValues() {
+		return mySetValues;
+	}
+	
+	public String getValue(String group, String name, String defaultValue) {
+		return mySetValues.getValue(group, name, defaultValue);
+	}
+	
+	public void setValue(String group, String name, String value, String category) {
+		mySetValues.setValue(group, name, value, category);
+	}
+	
+	public void unsetValue(String group, String name) {
+		myDeletedValues.put(group, name);
+		mySetValues.unsetValue(group, name);
+	}
+	
+	public void removeGroup(String group) {
+		myDeletedGroups.add(group);
+		mySetValues.removeGroup(group);
+	}
+	
+	public void clear() {
+		myDeletedValues.clear();
+		myDeletedGroups.clear();
+		mySetValues.clear();
+	}
+}
diff --git a/src/org/zlibrary/core/options/config/ZLGroup.java b/src/org/zlibrary/core/options/config/ZLGroup.java
index e94626f4a..dded67a18 100644
--- a/src/org/zlibrary/core/options/config/ZLGroup.java
+++ b/src/org/zlibrary/core/options/config/ZLGroup.java
@@ -2,7 +2,7 @@ package org.zlibrary.core.options.config;
 
 import java.util.*;
 
-public class ZLGroup {
+public final class ZLGroup {
 	private Map<String, ZLOptionValue> myData;
 	
 	public ZLGroup (){
@@ -13,12 +13,12 @@ public class ZLGroup {
 		return Collections.unmodifiableCollection(myData.values());
 	}
 	
-	public String getValue(String name, String defaultValue){
+	public String getValue(String name){
 		ZLOptionValue temp = myData.get(name);
 		if (temp != null){
 			return temp.getValue();
 		} else {
-			return defaultValue;
+			return null;
 		}
 	}
 	
diff --git a/src/org/zlibrary/core/options/config/ZLOptionValue.java b/src/org/zlibrary/core/options/config/ZLOptionValue.java
index f176b24a4..412e61309 100644
--- a/src/org/zlibrary/core/options/config/ZLOptionValue.java
+++ b/src/org/zlibrary/core/options/config/ZLOptionValue.java
@@ -19,6 +19,10 @@ public class ZLOptionValue {
 		return myValue;
 	}
 	
+	public String getName() {
+		return myName;
+	}
+	
 	public String getCategory() {
 		return myCategory;
 	}
diff --git a/src/org/zlibrary/core/options/config/ZLConfig.java b/src/org/zlibrary/core/options/config/ZLSimpleConfig.java
similarity index 88%
rename from src/org/zlibrary/core/options/config/ZLConfig.java
rename to src/org/zlibrary/core/options/config/ZLSimpleConfig.java
index 251c39c07..8bc5567a4 100644
--- a/src/org/zlibrary/core/options/config/ZLConfig.java
+++ b/src/org/zlibrary/core/options/config/ZLSimpleConfig.java
@@ -2,7 +2,7 @@ package org.zlibrary.core.options.config;
 
 import java.util.Map;
 
-public interface ZLConfig {
+public interface ZLSimpleConfig {
 	
 	public void removeGroup(String name);
 
diff --git a/src/org/zlibrary/core/options/config/ZLSimpleConfigImpl.java b/src/org/zlibrary/core/options/config/ZLSimpleConfigImpl.java
new file mode 100644
index 000000000..2786008aa
--- /dev/null
+++ b/src/org/zlibrary/core/options/config/ZLSimpleConfigImpl.java
@@ -0,0 +1,69 @@
+package org.zlibrary.core.options.config;
+
+import java.util.*;
+
+/**
+ * класс Конфиг. это своеобразная структура опций.
+ * основное поле myData содержит список групп, которым
+ * в качестве ключей сопоставляются их имена.
+ * @author Администратор
+ *
+ */
+/*package*/ class ZLSimpleConfigImpl implements ZLSimpleConfig {
+	// public abstract void unsetValue(String group, String name);
+
+	// public abstract  boolean isAutoSavingSupported() const = 0;
+	// public abstract  void startAutoSave(int seconds) = 0;
+	private Map<String, ZLGroup> myData;
+	
+	public ZLSimpleConfigImpl() {
+		myData = new LinkedHashMap<String, ZLGroup>();
+	}
+	
+	protected void clear() {
+		myData.clear();
+	}
+	
+	public Map<String, ZLGroup> getGroups() {
+		return Collections.unmodifiableMap(myData);
+	}
+	
+	public void removeGroup(String group) {
+		if (myData.get(group) != null){
+			myData.remove(group);
+		}
+	}
+
+	public String getValue(String group, String name, String defaultValue) {
+		if (myData.get(group) != null){
+			return myData.get(group).getValue(name);
+		} else{
+			return defaultValue;
+		}
+	}
+	
+	public void setValue(String group, String name, String value, String category) {
+		if (myData.get(group) != null){
+			myData.get(group).setValue(name, value, category);
+		} else {
+			ZLGroup newGroup = new ZLGroup();
+			newGroup.setValue(name, value, category);
+							myData.put(group, newGroup);
+		}
+	}
+	
+	public void unsetValue(String group, String name) {
+		myData.get(group).unsetValue(name);
+	}
+	
+	/**
+	 * метод вывода в строку
+	 */
+	public String toString() {
+		StringBuffer sb = new StringBuffer();
+		for (String categoryName : myData.keySet()){
+			sb.append("" + categoryName + "\n\n" + myData.get(categoryName) + "\n");
+		}
+		return sb.toString();
+	}   
+}
diff --git a/src/org/zlibrary/core/options/config/reader/ZLConfigReader.java b/src/org/zlibrary/core/options/config/reader/ZLConfigReader.java
index 0b37aa015..9fd8b7a85 100644
--- a/src/org/zlibrary/core/options/config/reader/ZLConfigReader.java
+++ b/src/org/zlibrary/core/options/config/reader/ZLConfigReader.java
@@ -51,6 +51,7 @@ import org.zlibrary.core.options.config.*;
 		}
 		
 		public void endDocument() {
+			myConfig.applyDelta();
 		}
 	}
 	
diff --git a/src/org/zlibrary/core/options/config/writer/ZLConfigWriter.java b/src/org/zlibrary/core/options/config/writer/ZLConfigWriter.java
index 938529191..271768593 100644
--- a/src/org/zlibrary/core/options/config/writer/ZLConfigWriter.java
+++ b/src/org/zlibrary/core/options/config/writer/ZLConfigWriter.java
@@ -7,7 +7,7 @@ import org.zlibrary.core.options.config.*;
 
 /*package*/ class ZLConfigWriter implements ZLWriter {
    
-	private ZLConfig myConfig = ZLConfigInstance.getInstance();
+	private ZLSimpleConfig myConfig = ZLConfigInstance.getInstance();
 	private File myDestinationDirectory;
 	
 	public ZLConfigWriter(String path){
@@ -34,6 +34,10 @@ import org.zlibrary.core.options.config.*;
 		}
 	}
 	
+	public void writeDelta() {
+		//TODO ДОПИСАТЬ, ИСПОЛЬЗУЯ СТРОЕНИЕ ФАЙЛА ДЕЛЬТЫ ИЗ СИШНОГО КОДА
+	}
+	
 	public void write() {
 		Map<String, ZLGroup> data = myConfig.getGroups();
 		// ключ - имя категории, значение - содержимое соответствующего файла