| Referential Metadata Structure | Structures | Defines the structure of an organized collection of referential metadata (Referential Metadata Set). | A Referential Metadata Structure defines a structured list of Referential Metadata Attributes for a given Referential Metadata Subject. Examples of Referential Metadata Attributes are those that describe quality information and methodologies. Examples of subject are: objects like a Questionnaire or a Classification, or collections of data like a Data Set, or any Data Point or set of Data Points created from a specific Data Structure. | Metadata Structure Definition |