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Metadata is  data about data. Two types of metadata exist: structural metadata and descriptive metadata. Structural metadata is data about the containers of data. Descriptive metadata uses individual instances of application data or the data content.hile the metadata application is manyfold covering a large variety of fields, there are specialised and well-accepted models to specify types of metadata. Bretheron & Singley (1994) distinguish between two distinct classes: structural/control metadata and guide metadata.
Core Metadata is associated with every document or Content Item, such as the basic audit information Created by and Modified by, which are widely used in EDMSs. Domain-based Metadata are those used in specific domain areas, such as the metadata used in the Clinical Trials electronic Trial Master File (eTMF) domain.s in the MP3 content classification example, the OASIS eTMF content model uses a published set of content classification categories in a hierarchy, as shown in Figure 12. Each content classification primary category contains Sub-Categories and Content Types.