A schematic view of the information model can be seen in Figure 2. Figure : SDMX Information Schematic View ESMS The Euro SDMX Metadata Structure (ESMS) contains the description and representation of statistical metadata concepts to be used for documenting statistical datasets and for providing summary information useful for assessing data quality and the production process in general. The broad concepts used are based on SDMX cross- domain concepts as published in the SDMX Glossary (last version published in 2016). Its structure (i.e. allowed content) is defined using an SDMX Metadata Structure Definition. The ESMS is addressed to the countries which are part of the European Statistical System and was embedded in a European Recommendation published in 2009. It is implemented both at Eurostat and at national level: the application of the concepts and sub concepts at European level and at national level is stated in the ESS guidelines. The information to be entered is normally free text, but some coded elements may be introduced in the future: this is indicated in the column "representation" below. The ESMS allows the creation of different output files comprising information related to all the concepts listed or a subset of those concepts. These output files can be used for different purposes (data dissemination, quality reporting, etc.). A fragment of the ESMS specification (release 4, 2014) is shown in Figure 3. Figure : Fragment of ESMS specification Another standardised metadata structure currently in use is the “ESS Standard Quality Report Structure” Quality reports are produced and partly disseminated by Eurostat in this format. Eurostat has also recently introduced a "Single Integrated Metadata Structure" (SIMS), which represents the union of referential metadata attributes coming from ESMS and ESQRS, providing an integrated framework of concepts on quality assessment and more general reference metadata. Open Data standards and application profiles W3C DCAT The basis for DCAT-AP is the specification of the Data Catalog Vocabulary (DCAT). DCAT was developed in the period from June 2011 through December 2013 by the Government Linked Data Working Group. The specification was published as a W3C Recommendation in January 2014.
release date dct:issued rdfs:Literal typed as xsd:date or xsd:dateTime This property contains the date of formal issuance (e.g., publication) of the Distribution. 0..1 rights dct:rights dct:RightsStatement This property refers to a statement that specifies rights associated with the Distribution. 0..1 status adms:status skos:Concept This property refers to the maturity of the Distribution. 0..1 dct:title rdfs:Literal This property contains a name given to the Distribution. This property can be repeated for parallel language versions of the description. 0..n update/ modification date dct:modified rdfs:Literal typed as xsd:date or xsd:dateTime This property contains the most recent date on which the Distribution was changed or modified. 0..1 Additional optional property for Distribution Property URI Range Usage note Card type dct:type rdfs:Resource This property links to a type of the Distribution, e.g. that it is a visualisation 0..1 Mandatory property for Agent Property URI Range note Card. name foaf:name rdfs:Literal This property contains a name of the agent. This property can be repeated for different versions of the name (e.g. the name in different languages) 1..n Recommended property for Property URI Range Usage note Card. type dct:type skos:Concept This property refers to a type of the that makes the Catalogue or Dataset available 0..1 Category Scheme Mandatory property for Category Scheme Property URI Range Usage note Card. title dct:title rdfs:Literal This property contains a name of the category scheme. May be repeated for different versions of the name 1..n Category Mandatory property for Category Property URI Range Usage note Card. preferred label skos:prefLabel rdfs:Literal This property contains a preferred of the category. This property can be repeated for parallel language versions of the label. 1..n
Miranda Cristina Spanish National Catalogue. Nelson Chris Metadata Technology Ltd, UK. Perego Andrea Joint Research Centre (JRC). Peristeras Vassilios Programme Officer of ISA and responsible for the SEMIC project. Pesoli Davide SciamLab, Italy. Rizzi Daniele European Data Portal. Roug Søren European Environmental Agency. Starace Paolo Sciamlab, Italy. Van Gemert Willem Publications Office of the European Union. Van Nuffelen Bert Tenforce, Belgium. Vask Alan Marketing and Dissemination Department, Estonia. Winstanley Peter Scottish Government. Yang Jim J. Agency for Public Management and eGovernment (Difi), Norway. Zajac Agnieszka Publications Office of the European
Distribution dct:description dct:format dct:license dcat:byteSize spdx:checksum foaf:page dct:language dct:conformsTo subproperty of dct:format dct:issued dct:rights adms:status dct:title dct:modified dct:type Document foaf:Document Frequency dct:Frequency Identifier skos:notation Kind vcard:Kind Licence Document dct:type Linguistic System Literal rdfs:Literal Location dct:Location Media Type or Extent Period Of Time Provenance Statement Publisher Type skos:Concept Resource rdfs:Resource Rights Statement Size or duration Standard dct:Standard Status skos:Concept
StatDCAT-AP entered its public review period on 30 August 2016, lasted until 31 October 2016. During that period twenty issues from five bodies (the National Statistics Institutes of France and Norway, Open Data Portal in the Czech Republic, the Permanent Representation of Denmark to the European Union and the Ministry of Finance of Brazil) were submitted on the draft version 4. Following the methodology, all the working documents were published on Joinup, and all the issues were documented in an issue tracker and discussed via a public accessible mailing list. The issues were grouped in four categories for facilitating resolution: Issues for which we propose changes (Accept/Reject). Issues for which we propose the inclusion of clarifications for implementers Issues that need further work (outside the scope at the time being). Additional issues/errors that will be corrected (editorial issues, typos). All the issues were discussed during the last meeting of the working group, and after reaching consensus amongst the members of the working group on their resolution, all the changes and updates were applied in the Final version of StatDCAT-AP. Issue Description Proposed resolution Final resolution Definition & label of property The property is defined as "unit of measurement" not as SDMX/Data Cube ‘measure‘. Rename statMeasure to statUnitMeasure. Add a property that is equivalent with SDMX/Data Cube measure. Accepted proposed resolution. Consider adding 'measure' property for future revisions of StatDCAT-AP Property on Distribution The property is a characteristic of the Dataset and applies to all Distributions. Define the property on Distribution to different Distributions to use different units of measurement Rejected proposed resolution. Add a clarification that attributes, dimensions and measures are ‘conceptual’ entities that apply to all distribution formats, e.g. in case a dataset is provided both in SDMX and in Data Cube, and therefore fit better on the Dataset level. Properties and on RDF Distribution On RDF Distribution stat:dimension and stat:attribute could replaced by link to Use dct:conformsTo to link to qb:DataStructureDefinition instead of stat:dimension and stat:attribute for RDF Distributions Rejected proposed resolution. Add clarification that using the stat properties for all types of distributions preserves coherence across formats; a RDF distribution may use dct:conformsTo in addition.
values would be extracted from SDMX. Specifying the length of time series How can weekly and quarterly series be expressed? Add clarification in section 6.2.4 how the combination of temporal coverage and frequency can be used to express all of time series. Accepted proposed resolution. Relationship StatDCAT-AP and Data Cube How are dcat:Dataset, qb:DataSet, and related? Add full example of a StatDCAT-AP-compliant description of a Data Cube DataSet. W3C SDSVoc workshop in Amsterdam 30 November-1 December 2016 might provide further advice. Accepted proposed resolution. Relationship between StatDCAT-AP and DDI How can DDI descriptions of datasets be expressed using StatDCAT-AP? Contacts have been established with the DDI initiative, which may lead to development of an additional Annex in the future. No change in the specification. Accepted proposed resolution. Full RDF expression of SIMS Suggests development of a full RDF expression of SIMS. It is out of scope for the StatDCAT-AP activity but may be taken up by others. No change in the specification. Accepted proposed resolution. SIMS as part of the StatDCAT vocabulary Suggests that SIMS could be a part of StatDCAT-AP. It may be considered in future work in relation with more elaborate treatment of quality aspects. No change in the specification. Accepted proposed resolution. Modelling SDMX in StatDCAT-AP Suggests an extension to model the SDMX metadata flow in StatDCAT-AP. The subject of SIMS has been raised in Issues 13 and 14 and the relevance of support for the SDMX Metadataflow will be taken into account when assessing how best to expand the support for quality metadata in the next version of StatDCAT-AP. No change in the specification. Accepted proposed resolution. Visualisation for other types of datasets Suggests that the approach to identify visualisations is also relevant for other types of data sets, not just statistical datasets. It will be considered in further development of DCAT-AP. No change in the specification. Accepted proposed resolution. Typo DVAT Error/editorial comment Correct the reported Accepted proposed resolution. Property in UML class diagram Error/editorial comment Correct the reported error. Accepted proposed resolution. Example of Visualisation Error/editorial comment Correct the reported Accepted proposed resolution. Missing namespaces Error/editorial comment Correct the reported error. Accepted proposed resolution.