Conceptual Model

classDiagram
  StructuralMetadata <|-- DataStructure
  StructuralMetadata <|-- Codelist
  StructuralMetadata <|-- ConceptScheme

  class StructuralMetadata {

  }

  class DataStructure {
    Defines the structure and allowed content of a dataset
  }

  class ConceptScheme {
    A collection of SDMX Concepts
  }

  class Codelist {
     A enumeration of values
  }