ISO/IEC 15476-3:20 06解释了CDIF语义元模型的数据定义主题区域，该主题区域定义了用于结构化数据的原始数据类型和对象。CDIF语义元模型用于确保使用CDIF通信的工具传输的信息以约定的含义表达。该主题区域包含用作其他主题区域标准的数据组件基础的元对象，以及适用于所有数据相关元对象的元关系和元属性。 ISO/IEC 15476-3:20 06旨在供任何希望了解和/或使用CDIF的人使用。它提供了CDIF语义元模型的单个主题区域的定义。它适用于: 那些评估CDIF的人那些希望了解CDIF转让的原则和概念的人；以及那些发展中的进出口商。

ISO/IEC 15476-3:2006 explains the Data definitions subject area of the CDIF semantic metamodel, that defines the primitive data types and the objects which are used for structured data. The CDIF semantic metamodel is used to ensure that the information transferred by tools communicating using CDIF is expressed with an agreed meaning. This subject area contains meta-objects that are used as the basis of the data components of other subject area standards, and also meta-relationships and meta-attributes that are applicable to all data-related meta-objects. ISO/IEC 15476-3:2006 is intended to be used by anyone wishing to understand and/or use CDIF. It provides a definition of a single subject area of the CDIF semantic metamodel. It is suitable for:

• Those evaluating CDIF;
• Those who wish to understand the principles and concepts of a CDIF transfer; and
• Those developing importers and exporters.