app/views/response_domains/_response_domain_code.xml.erb
<CodeDomain blankIsMissingValue="false">
<r:CodeListReference>
<%= render 'exports/exploded_urn', object: response_domain.code_list, reference: true %>
</r:CodeListReference>
<r:ResponseCardinality minimumResponses="<%= response_domain.min_responses || 1 %>" maximumResponses="<%= response_domain.max_responses || 1 %>"/>
</CodeDomain>