<md:RequestedAttribute xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" Name="attr" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic" FriendlyName="Attribute" isRequired="true">
  <saml:AttributeValue xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">value1</saml:AttributeValue>
</md:RequestedAttribute>