Conceptual Model

classDiagram
  ReferenceMetadata -->  "1..*" MetadataReport
  MetadataReport "*" --> "1" MetadataStructureDefinition
  MetadataReport "1" *-- "0..*" MetadataAttribute
  MetadataAttribute "1" *-- "0..*" MetadataAttribute

  class ReferenceMetadata {
    Metadata describing methodology, quality, and context
  }

  class MetadataReport {
    Metadata describing a specific subject
  }

  class MetadataStructureDefinition {
    Defines the valid concepts and allowed content for a metadata report
  }

  class MetadataAttribute {
    Reported values
  }