原信息是什么概念，该如何理解啊 HarmonyOS鸿蒙Next

您可以参考一下metadata标签：

module.json5配置文件-应用配置文件（Stage模型）-开发基础知识-基础入门 - 华为HarmonyOS开发者

Metadata主要是通过一个TAG（Key），去找对应的Data，用于传递参数和配置信息，减少内存拷贝操作。

参考demo

import { hilog } from '@kit.PerformanceAnalysisKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { bundleManager, common } from '@kit.AbilityKit';

@Entry
@Component
struct getMetadata {
  @State message: string = 'Hello World';
  context = this as common.UIAbilityContext;

  build() {
    RelativeContainer() {
      Text(this.message)
        .id('HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
        .onClick(() => {
          let bundleFlags = bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_METADATA | bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION;
          try {
            bundleManager.getBundleInfoForSelf(bundleFlags).then((bundleInfo: bundleManager.BundleInfo) => {
              hilog.info(0x0000, 'testTag', 'getBundleInfoForSelf successfully. Data: %{public}s',
                JSON.stringify(bundleInfo));
              hilog.info(0x0000, 'testTag', 'getBundleInfoForSelf successfully. MetaData: %{public}s',
                JSON.stringify(bundleInfo.appInfo.metadataArray));
              let arr = bundleInfo.appInfo.metadataArray;
              console.info("testTag arr is ", (arr instanceof Array));
              hilog.info(0x0000, 'testTag', 'arr : %{public}s', JSON.stringify(arr.length));
              for (let data of arr) {
                hilog.info(0x0000, 'testTag', 'MetaData name: %{public}s', JSON.stringify(data.moduleName));
                for (let metadata of data.metadata) {
                  hilog.info(0x0000, 'testTag', 'MetaData content: %{public}s', JSON.stringify(metadata));
                }
              }
            }).catch((err: BusinessError) => {
              hilog.error(0x0000, 'testTag', 'getBundleInfoForSelf failed. Cause: %{public}s', err.message);
            });
          } catch (err) {
            let message = (err as BusinessError).message;
            hilog.error(0x0000, 'testTag', 'getBundleInfoForSelf failed: %{public}s', message);
          }
        })
    }
    .height('100%')
    .width('100%')
  }
}

元服务问题您可以参考链接： 元服务定义 - 华为HarmonyOS开发者