V. Del Vecchio - Sdmx versus other standards
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V. Del Vecchio - Sdmx versus other standards

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L’iniziativa SDMX in Istat: da progetti pilota a Stat2015 ...

L’iniziativa SDMX in Istat: da progetti pilota a Stat2015

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  • 1. SDMX versus other standards29 January 2013 SDMX seminar – ISTAT
  • 2. Technical Working GroupInitial issue list: – Global Registry – IT tools – Security Guidelines & Web services – Documentation – SDMX & other standardsFurther issues: – Expressions and calculations – JSON implementation29 January 2013 SDMX seminar – ISTAT 2
  • 3. SDMX and other standardsThe goals of the comparison:Deal with all the possible kind of data• Dimensional data• Questionnaires data• Business registers dataSupport all the phases of the business process• Data design• Data exchange• Data processing29 January 2013 SDMX seminar - ISTAT 3
  • 4. SDMX and other standardsThe status of the analisys:Mid-way: working plan covers 2012 and 2013 – Assess the SDMX capabilities (ascertain the ability of SDMX of dealing with real use cases, also versus other standards) – Suggest the SDMX evolution (propose SDMX upgrades, also taking advantage of the state-of-the-art of other standards)29 January 2013 SDMX seminar - ISTAT 4
  • 5. Other data models / standardsDDI – Data Documentation Initiative - International standard for describing data from the social, behavioral, and economic sciences, developed by the DDI Alliance, a self-sustaining membership organizationGSIM – Generic Statistical Information Model - Reference framework for the information used in the production of the official statistics, developed by HLG-BAS (High Level Group for Strategic Development in Business Architecture in Statistics)Matrix model - User oriented information model developed by the Bank of Italy and used since 1989 to design, exchange and process statistical data by means of active metadataRDF – Resource Description Framework –Standard model for data interchange on the WEB consisting in a suite of recommendations of the W3C (World Wide Web Consortium)XBRL – eXtensible Business Reporting Language - A royalty-free, open specification to describe financial information for public and private companies and other organizations developed by XBRL International, a no-profit consortium29 January 2013 SDMX seminar - ISTAT 5
  • 6. Some Use CasesESCB / Bank of Italy • Register of Institutions and Affiliates Database (RIAD) • Balance of Payment direct reporting questionnaires • Securities Register • Matrix model & INFOSTAT platformEurostat / ISTAT • EuroGroups Register (EGR) • Labour Force Survey questionnaires • EU Survey on Income and Living Conditions of HouseholdsFAO • Questionnaire on Crop and Livestock production & utilizationInfostat Slovakia • ESSnet questionnaires in eCollect-X • Statistical Survey of the Accomodation EstablishmentsMetadata Technology • The RDF/SDMX Data Cube VocabularyXBRL community • Formula language29 January 2013 SDMX seminar - ISTAT 6
  • 7. Main Outcomes (1)• The SDMX information model contains the basic structures to represent dimensional, questionnaires and register data – SDMX represents mathematical functions (Cubes) having independent variables (dimensions) and dependent variables (measures and attributes) – Dimensional, questionnaires and register data can be represented as sets of mathematical functions according to the approach of the Matrix model, described in “SDMX support for different data” (SDMX global conference – Washington - 2011)29 January 2013 SDMX seminar - ISTAT 7
  • 8. Main Outcomes (2)• The SDMX standard needs an Expression Language to define validation and calculation rules – Matrix model  EXL (EXpression Language) – XBRL language  Formula language – DDI, GSIM  no calculation language• New TWG WP Item “Expressions and calculations”29 January 2013 SDMX seminar - ISTAT 8
  • 9. Main Outcomes (3)Improve features for historical representation:• Versioning of Codes to simplify the management of Codelists, DSDs … – Codelists are versioned, not Codes – Problem: If a Code changes, a new version is needed for its Codelist and for each DSDs that uses such Codelist – Solution: time validity of Codes ( see Matrix model)• Standard representation of changes with time – merge, incorporate, split … of entities (countries, institutional units …) ( see Matrix model)29 January 2013 SDMX seminar - ISTAT 9
  • 10. Main Outcomes (4)Improve the data representation features:• Allow using many measures in exchanging multi- measure data, without mandatory measure dimension• Allow many dimensions in the role of “measure dimension”• No mandatory names Obs_Value and Time_period, (they force to change the originary names of measures and time)• For an “interval” Time_period, allow specifying start_date / end_date, not only start_date / duration• Improve the specification of the action to be performed (Insert/Update/Delete …) and allow specifying the order of the actions, essential for integrity in some use cases 29 January 2013 SDMX seminar - ISTAT 10
  • 11. Main outcomes (5)• Support semantic WEB – Allow dissemination based on RDF ( see Data Cube Vocab.)• Support to “active” questionnaires – SDMX doesn’t repesent questions – Representation of questions and mapping between questions and variables (concepts) of the data structure ( see DDI model;  see eCollect-X solution) – To be better analyzed, this is a field of possible integration with DDI• Possible unification of DSD and MSD ? – metatada are data themselves – To be better evaluated (different opinions were expressed on this topic)29 January 2013 SDMX seminar - ISTAT 11
  • 12. In synthesis• Considerable inputs and findings, which require deeper analysis to be implemented• Need of prioritizing the suggestions and identifying what can be achieved in the current SDMX version 2.1 and what should be faced in the following versions• It would be appropriate a general comparison of SDMX, GSIM and DDI IMs, mappingcorresponding artefacts as much as possible; contributions for this topics can come from: – SDMX – DDI dialogue – GSIM work29 January 2013 SDMX seminar - ISTAT 12
  • 13. Some referencesGSIM - from UNECE wikihttp://www1.unece.org/stat/platform/display/metis/Generic+Statistical+Information+Model+%28GSIM%29SDMX-DDI Dialogue - from UNECE wikihttp://www1.unece.org/stat/platform/display/metis/SDMX+DDI+Dialogue+-+Overview+Pagehttp://www1.unece.org/stat/platform/display/metis/Usage+scenarios+for+SDMX+and+DDISDMX - eCollect-Xhttp://www.ecollect-x.eu/en/about/project-history.aspxSDMX-RDF Data Cube Vocabularyhttp://www.w3.org/2011/gld/wiki/Data_Cube_VocabularyThe Matrix modelhttp://www.bancaditalia.it/statistiche/quadro_norma_metodo/modell_SIShttp://www.czso.cz/conference2009/proceedings/data/process/piazza_paper.pdfXBRL Formulahttp://www.xbrl.org/SpecRecommendations29 January 2013 SDMX seminar - ISTAT 13
  • 14. Contributors – European Central Bank – Eurostat – FAO – Infostat Slovakia – ISTAT – Metadata Technology – National Bank of Italy – National Bank of Poland – UNECE29 January 2013 SDMX seminar - ISTAT 14
  • 15. SDMX versus other standards Vincenzo Del Vecchio vincenzo.delvecchio@bancaditalia.it29 January 2013 SDMX seminar - ISTAT 15