diff --git a/services/src/test/java/org/fao/geonet/api/registries/vocabularies/KeywordsApiTest.java b/services/src/test/java/org/fao/geonet/api/registries/vocabularies/KeywordsApiTest.java
index 01871cb85a0..2545a897882 100644
--- a/services/src/test/java/org/fao/geonet/api/registries/vocabularies/KeywordsApiTest.java
+++ b/services/src/test/java/org/fao/geonet/api/registries/vocabularies/KeywordsApiTest.java
@@ -249,6 +249,6 @@ public void testImportOntologyToSkos() throws Exception {
             "Mobility Theme", scheme.getChildText("title", NAMESPACE_DCT));
 
         List concepts = thesaurus.getChildren("Concept", SKOS_NAMESPACE);
-        assertEquals(123, concepts.size());
+        assertEquals(121, concepts.size());
     }
 }
diff --git a/web/src/main/webapp/xslt/services/thesaurus/owl-to-skos.xsl b/web/src/main/webapp/xslt/services/thesaurus/owl-to-skos.xsl
index 449ee6d70d5..b7a71380331 100644
--- a/web/src/main/webapp/xslt/services/thesaurus/owl-to-skos.xsl
+++ b/web/src/main/webapp/xslt/services/thesaurus/owl-to-skos.xsl
@@ -24,9 +24,9 @@
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                 xmlns:owl="http://www.w3.org/2002/07/owl#"
                 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:terms="http://purl.org/dc/terms/"
                 xmlns:skos="http://www.w3.org/2004/02/skos/core#"
+                xmlns:xs="http://www.w3.org/2001/XMLSchema"
                 exclude-result-prefixes="#all"
                 version="2.0">
 
@@ -40,12 +40,38 @@
 
   <xsl:template mode="owl-to-skos"
                 match="owl:Ontology">
-    <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/">
+    <rdf:RDF>
+      <xsl:namespace name="skos" select="'http://www.w3.org/2004/02/skos/core#'"/>
+      <xsl:namespace name="rdf" select="'http://www.w3.org/1999/02/22-rdf-syntax-ns#'"/>
+      <xsl:namespace name="dc" select="'http://purl.org/dc/elements/1.1/'"/>
+      <xsl:namespace name="terms" select="'http://purl.org/dc/terms/'"/>
       <skos:ConceptScheme rdf:about="{@rdf:about}">
-        <xsl:copy-of select="dcterms:*|skos:*"/>
+        <xsl:copy-of select="terms:*|skos:*[local-name() != 'hasTopConcept']" copy-namespaces="no"/>
+
+        <!--
+        Custom case for Mobility DCAT theme vocabulary top concepts.
+        https://mobilitydcat-ap.github.io/controlled-vocabularies/mobility-theme/latest/index.html#/
+
+        The vocabulary contains 2 top concepts:
+        <skos:hasTopConcept rdf:resource="https://w3id.org/mobilitydcat-ap/mobility-theme/data-content-category"/>
+        <skos:hasTopConcept rdf:resource="https://w3id.org/mobilitydcat-ap/mobility-theme/data-content-sub-category"/>
+        which are not really needed for browsing the main categories and sub categories.
+
+        Use the narrower terms of the "content category" top concept as the top concepts of the scheme
+        to facilitate keyword selection in editor and generate proper facet hierarchy in search.
+        -->
+        <xsl:variable name="mobilityThemeTopConcept"
+                      select="../owl:NamedIndividual[@rdf:about = 'https://w3id.org/mobilitydcat-ap/mobility-theme/data-content-category']"/>
+        <xsl:choose>
+          <xsl:when test="$mobilityThemeTopConcept">
+            <xsl:for-each select="$mobilityThemeTopConcept/skos:narrower">
+              <skos:hasTopConcept rdf:resource="{@rdf:resource}"/>
+            </xsl:for-each>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:copy-of select="skos:hasTopConcept" copy-namespaces="no"/>
+          </xsl:otherwise>
+        </xsl:choose>
       </skos:ConceptScheme>
 
       <xsl:apply-templates mode="owl-to-skos"
@@ -53,10 +79,29 @@
     </rdf:RDF>
   </xsl:template>
 
+  <xsl:variable name="excludedConcepts"
+                select="(
+                'https://w3id.org/mobilitydcat-ap/mobility-theme/data-content-category',
+                'https://w3id.org/mobilitydcat-ap/mobility-theme/data-content-sub-category'
+                )"
+                as="xs:string*"/>
+
+  <xsl:template mode="owl-to-skos"
+                match="owl:NamedIndividual[@rdf:about = $excludedConcepts]
+                            |skos:broader[@rdf:resource = $excludedConcepts]"/>
+
   <xsl:template mode="owl-to-skos"
                 match="owl:NamedIndividual">
     <skos:Concept rdf:about="{@rdf:about}">
-      <xsl:copy-of select="skos:*"/>
+      <xsl:apply-templates mode="owl-to-skos" select="skos:*"/>
     </skos:Concept>
   </xsl:template>
+
+  <xsl:template mode="owl-to-skos"
+                match="@*|node()">
+    <xsl:copy copy-namespaces="no">
+      <xsl:apply-templates select="@*|node()" mode="owl-to-skos"/>
+    </xsl:copy>
+  </xsl:template>
+
 </xsl:stylesheet>