1. © Metadata Technology ESCWA SDMX Workshop Session: Hierarchical Code List and Statistical Classification

2. © Metadata Technology Hierarchical Code List (HCL): Schematic Hierarchical Code HCL references Code Code List Level child hierarchical codes HCL Allows One Code to have many Parent Codes Allows Hierarchical Codes to be built from many Code Lists Can have formal Levels Note that Codes are not maintained in an HCL – an HCL references Codes in Code Lists –i.e. it is a view on Codes in one or more Code Lists Code List Can have a hierarchy of codes but one Code can have only one Parent Code SDMX is not a Classification Management System Hierarchy parent code child level

3. © Metadata Technology Example: HCL with Codes Having Multiple Parents: Simple Code Lists IAEG Resources: HCL/HierarchicalCodelistExample.xml

4. © Metadata Technology Example: HCL with Codes Having Multiple Parents: Hierarchical Code List

5. © Metadata Technology Example: HCL with Codes Having Multiple Parents: Hierarchical Code List

6. © Metadata Technology Hierarchical Code List: XML Note the use of the XML hierarchy to build a code hierarchy http://localhost:8080/FusionRegistry/ws/restInterfaceV2_1/HierarchicalCodelist/IIAEG/HCL_COUNTRY_GROUPS

7. © Metadata Technology Example Classification NACE Codes in SDMX

8. © Metadata Technology NACE: Extract

9. © Metadata Technology NACE Extract: SDMX Code List Upload: IAEG Resources HCL/Nace_Codes.xml

10. © Metadata Technology NACE Extract: SDMX Code List (XML) One Code can have a maximum of one parent Note that there is no structure to carry the semantic for the Level – for this you need a Hierarchical Code List http://localhost:8080/FusionRegistry/ws/restInterfaceV2_1/Codelist/IAEG/CL_NACE_CODES

11. © Metadata Technology Hierarchical Code List (HCL): Schematic Hierarchical Code HCL Code Code List Level Hierarchy parent code HCL_NACE SECTION DIVISION GROUP CLASS H_NACE A A CL_NACE_CODES 01 011 01 011 B B

12. © Metadata Technology Classification: Neuchâtel

13. © Metadata Technology Hierarchical Code List: SDMX Model Note that the HCL does not contain codes – it references them from an SDMX Code List

14. © Metadata Technology Classification: Neuchâtel and SDMX Category/ Categorisation Hierarchical Code List Versionable Not Directly Supported Code List Map Code Map Level Hierarchical Code Category Categorisation Not Supported

15. © Metadata Technology Code Map: SDMX Model A Code in one Code List can be mapped to multiple Codes in another Code List – each one is a separate Code Map