Metadata model for ontology based on XML (eXtensible Markup Language) is processed by attribute-calculator, and corresponding DTD (Document Type Definition) is provided to guide document creating.

• 将基于XML (extensibleMarkupLanguage)的本体元数据模型作为属性求值器处理的对象, 提供相应的文档类型定义 (DTD: DocumentTypeDefinition)以指导XML文档的创建;