Thesaurus / Add support for codelist described using SDMX

SDMX is a common format used to statistical data and can be used to
describe codelist. eg https://ec.europa.eu/eurostat/databrowser/bulk?lang=en&selectedTab=codeList

Add possibility to import those codelist as SKOS format.

Filename must use extension `.sdmx`.

Similar to #7674

services/src/main/java/org/fao/geonet/api/registries/vocabularies/KeywordsApi.java

@@ -141,7 +141,7 @@ public class KeywordsApi {
     @Autowired
     ThesaurusManager thesaurusManager;
 
-    List<String> allowedExtensions = Arrays.asList("rdf", "owl", "xml");
+    List<String> allowedExtensions = Arrays.asList("rdf", "owl", "xml", "sdmx");
 
     /**
      * Search keywords.
@@ -720,7 +720,7 @@ public void deleteThesaurus(
      */
     @io.swagger.v3.oas.annotations.Operation(
         summary = "Uploads a new thesaurus from a file",
-        description = "Uploads a new thesaurus."
+        description = "Supported thesaurus are RDF/XML files using SKOS specification, OWL file describing NamedIndividual elements or SDMX file describing Codelist element. For RDF, extension must be .rdf or .xml, for OWL, .owl and for SDMX, .sdmx."
     )
     @RequestMapping(
         method = RequestMethod.POST,
@@ -826,7 +826,13 @@ public String uploadThesaurus(
     }
 
     private static String getStylesheetForExtension(String stylesheet, String extension) {
-        return extension.equals("owl") ? "owl-to-skos" : stylesheet;
+        if (extension.equals("owl")) {
+            return "owl-to-skos";
+        } else if (extension.equals("sdmx")) {
+            return "sdmx-to-skos";
+        } else {
+            return stylesheet;
+        }
     }
 
 

web/src/main/webapp/xslt/services/thesaurus/sdmx-to-skos.xsl

@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright (C) 2001-2024 Food and Agriculture Organization of the
+  ~ United Nations (FAO-UN), United Nations World Food Programme (WFP)
+  ~ and United Nations Environment Programme (UNEP)
+  ~
+  ~ This program is free software; you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation; either version 2 of the License, or (at
+  ~ your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful, but
+  ~ WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  ~ General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with this program; if not, write to the Free Software
+  ~ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+  ~
+  ~ Contact: Jeroen Ticheler - FAO - Viale delle Terme di Caracalla 2,
+  ~ Rome - Italy. email: [email protected]
+  -->
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+                xmlns:sdmx="http://www.w3.org/2002/07/sdmx#"
+                xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+                xmlns:dc="http://purl.org/dc/elements/1.1/"
+                xmlns:dcterms="http://purl.org/dc/terms/"
+                xmlns:skos="http://www.w3.org/2004/02/skos/core#"
+                xmlns:sdmxm="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/message"
+                xmlns:sdmxs="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/structure"
+                xmlns:sdmxc="http://www.sdmx.org/resources/sdmxml/schemas/v2_1/common"
+                exclude-result-prefixes="#all"
+                version="2.0">
+
+  <!-- Convert sdmx codelist into SKOS RDF/XML format supported by GeoNetwork.  -->
+  <xsl:output method="xml" encoding="UTF-8" indent="yes"/>
+
+  <xsl:template match="/">
+    <xsl:apply-templates mode="sdmx-to-skos"
+                         select=".//sdmxs:Codelist"/>
+  </xsl:template>
+
+  <xsl:template mode="sdmx-to-skos"
+                match="sdmxs:Codelist">
+    <rdf:RDF xmlns:skos="http://www.w3.org/2004/02/skos/core#"
+             xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+             xmlns:dc="http://purl.org/dc/elements/1.1/"
+             xmlns:dcterms="http://purl.org/dc/terms/">
+      <skos:ConceptScheme rdf:about="{@urn}">
+        <xsl:for-each select="sdmxc:Name">
+          <dc:title xml:lang="{@xml:lang}"><xsl:value-of select="."/></dc:title>
+        </xsl:for-each>
+
+        <xsl:for-each select="(sdmxc:Annotations/*[sdmxc:AnnotationType = 'LAST_UPDATED']/sdmxc:AnnotationTitle)[1]">
+          <dcterms:issued><xsl:value-of select="."/></dcterms:issued>
+          <dcterms:modified><xsl:value-of select="."/></dcterms:modified>
+        </xsl:for-each>
+      </skos:ConceptScheme>
+
+      <xsl:apply-templates mode="sdmx-to-skos"
+                           select="sdmxs:Code"/>
+    </rdf:RDF>
+  </xsl:template>
+
+  <xsl:template mode="sdmx-to-skos"
+                match="sdmxs:Code">
+    <skos:Concept rdf:about="{@urn}">
+      <xsl:for-each select="sdmxc:Name">
+        <skos:prefLabel xml:lang="{@xml:lang}"><xsl:value-of select="."/></skos:prefLabel>
+      </xsl:for-each>
+    </skos:Concept>
+  </xsl:template>
+</xsl:stylesheet>