diff --git a/MetaData.java b/MetaData.java
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+++ b/MetaData.java
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+// 多行注释，说明版权信息和许可证
+/*
+ * 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.
+ */
+
+// 导入所需的类
+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;
+
+// MetaData类继承自Task类，用于处理与任务相关的元数据
+public class MetaData extends Task {
+    // 类的标签，用于日志记录
+    private final static String TAG = MetaData.class.getSimpleName();
+
+    // 用于存储相关任务的全局唯一标识符
+    private String mRelatedGid = null;
+
+    // 设置元数据信息
+    public void setMeta(String gid, JSONObject metaInfo) {
+        try {
+            // 将全局唯一标识符添加到元数据信息中
+            metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
+        } catch (JSONException e) {
+            // 如果添加失败，记录错误日志
+            Log.e(TAG, "failed to put related gid");
+        }
+        // 设置任务的备注信息为元数据的字符串表示
+        setNotes(metaInfo.toString());
+        // 设置任务的名称为特定的元数据任务名称
+        setName(GTaskStringUtils.META_NOTE_NAME);
+    }
+
+    // 获取相关任务的全局唯一标识符
+    public String getRelatedGid() {
+        return mRelatedGid;
+    }
+
+    // 重写isWorthSaving方法，判断任务是否值得保存
+    @Override
+    public boolean isWorthSaving() {
+        // 如果任务的备注信息不为空，则认为值得保存
+        return getNotes() != null;
+    }
+
+    // 从远程JSON对象设置内容
+    @Override
+    public void setContentByRemoteJSON(JSONObject js) {
+        // 首先调用父类的设置内容方法
+        super.setContentByRemoteJSON(js);
+        // 如果备注信息不为空
+        if (getNotes() != null) {
+            try {
+                // 将备注信息转换为JSON对象，并获取全局唯一标识符
+                JSONObject metaInfo = new JSONObject(getNotes().trim());
+                mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
+            } catch (JSONException e) {
+                // 如果转换失败，记录警告日志，并设置全局唯一标识符为null
+                Log.w(TAG, "failed to get related gid");
+                mRelatedGid = null;
+            }
+        }
+    }
+
+    // 从本地JSON对象设置内容，此方法不应该被调用
+    @Override
+    public void setContentByLocalJSON(JSONObject js) {
+        // 如果被调用，抛出异常
+        throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
+    }
+
+    // 从内容获取本地JSON对象，此方法不应该被调用
+    @Override
+    public JSONObject getLocalJSONFromContent() {
+        // 如果被调用，抛出异常
+        throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
+    }
+
+    // 获取同步操作，此方法不应该被调用
+    @Override
+    public int getSyncAction(Cursor c) {
+        // 如果被调用，抛出异常
+        throw new IllegalAccessError("MetaData:getSyncAction should not be called");
+    }
+}
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