feat: update cardinality of skos:Concept

1.1/lido-v1.1-draft.xsd

@@ -6694,10 +6694,8 @@ target="https://www.getty.edu/research/tools/vocabularies/guidelines/ulan_3_6_bi
 
 	<xs:group name="conceptElementsSet" id="conceptElementsSet">
 		<xs:sequence>
-			<!-- add non-LIDO elements from external authority record here: (15-Jun-2018 db) -->
-			<xs:any minOccurs="0" maxOccurs="unbounded" processContents="skip"
+			<xs:any minOccurs="0" processContents="skip"
 				namespace="http://www.w3.org/2004/02/skos/core#"/>
-			<!-- end non-LIDO elements -->
 			<xs:element name="conceptID" type="lido:identifierComplexType" minOccurs="0"
 				maxOccurs="unbounded" id="conceptID">
 				<xs:annotation>