>
						<xforms:case id="set-id">
							<div>
								<h3>Set id</h3>
								<div>
									<xforms:input ref="instance('control-instance')/id" incremental="true">
										<xforms:label>id</xforms:label>
										<xforms:alert>Required</xforms:alert>
									</xforms:input>
									<!-- display trigger to set the @rdf:about of the concept for new ids in order to proceed with class selection -->
									<xforms:group ref=".[string-length(instance('control-instance')/id) &gt; 0]">
										<xforms:tr