diff --git a/MetaData.java b/MetaData.java
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+++ b/MetaData.java
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+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+
+public class MetaData extends Task {
+    /**实现功能：得到类的简写名称存入字符串TAG中（调用getSimpleName()函数） */
+    private final static String TAG = MetaData.class.getSimpleName();
+
+    private String mRelatedGid = null;
+    /**实现功能：设置数据，即生成元数据库（调用JSONObject库函数put（），Task类中的setNotes（）和setName（）函数） */
+    public void setMeta(String gid, JSONObject metaInfo) {
+        //对函数块进行注释
+        try {
+            metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
+            /**将这对键值放入metaInfo这个jsonobject对象中 */
+        } catch (JSONException e) {
+            Log.e(TAG, "failed to put related gid");
+            /**输出错误信息 */
+        }
+        setNotes(metaInfo.toString());
+        setName(GTaskStringUtils.META_NOTE_NAME);
+    }
+    /**实现功能：获取相关联的Gid */
+    public String getRelatedGid() {
+        return mRelatedGid;
+    }
+/**实现功能：判断当前数据是否为空，若为空则返回真即值得保存 */
+    @Override
+    public boolean isWorthSaving() {
+        return getNotes() != null;
+    }
+/**实现功能：使用远程json数据对象设置元数据内容（调用父类Task中的setContentByRemoteJSON（）函数） */
+    @Override
+    public void setContentByRemoteJSON(JSONObject js) {
+        super.setContentByRemoteJSON(js);
+        if (getNotes() != null) {
+            try {
+                JSONObject metaInfo = new JSONObject(getNotes().trim());
+                mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
+            } catch (JSONException e) {
+                Log.w(TAG, "failed to get related gid");
+                /**输出警告信息 */
+                mRelatedGid = null;
+            }
+        }
+    }
+/**实现功能：使用本地json数据对象设置元数据内容，一般不会用到，若用到，则抛出异常 */
+    @Override
+    public void setContentByLocalJSON(JSONObject js) {
+        // this function should not be called
+        throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
+        /**传递非法参数异常 */
+    }
+/**实现功能：从元数据内容中获取本地json对象，一般不会用到，若用到，则抛出异常 */
+    @Override
+    public JSONObject getLocalJSONFromContent() {
+        throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
+        /**传递非法参数异常 */
+    }
+/**实现功能：获取同步动作状态，一般不会用到，若用到，则抛出异常 */
+    @Override
+    public int getSyncAction(Cursor c) {
+        throw new IllegalAccessError("MetaData:getSyncAction should not be called");
+        /**传递非法参数异常 */
+    }
+
+}