Using Extensible Markup Language (EML) to describe metadata standard, it carries out metadata management and metadata expansiong. It can help user to query effectively and find resource quickly in the database.

• 用适合于描述元数据的可扩展语言 XML 来描述元数据标准 ,很大程度上实现了元数据的有效管理和可扩展性 ,为资源与环境数据库的资源快速导航和高效查询提供了有力的支持