feat: allow only SKOS when expanding skos:Concept

1.1/lido-v1.1-draft.xsd

@@ -143,6 +143,18 @@
 					</sch:assert>
 				</sch:rule>
 			</sch:pattern>
+			
+			<sch:pattern>
+				<sch:title>Expansion of skos:Concept</sch:title>
+				<sch:p>Ensures that when enriching a dataset with information retrieved via the URI provided in skos:Concept, only
+				SKOS properties are added to the dataset.</sch:p>
+				
+				<sch:rule context="skos:Concept" id="SKOS_properties">
+					<sch:report test="child::*/namespace-uri() != 'http://www.w3.org/2004/02/skos/core#'">
+						Only SKOS properties are allowed within skos:Concept.
+					</sch:report>
+				</sch:rule>
+			</sch:pattern>
 
 			<sch:pattern>
 				<sch:title>owl:sameAs</sch:title>