There are some issues which causes that WildFly Elytron Client Configuration File created based on elytron-1_0.xsd is not valid for clients:

• root element configuration is not included in elytron-1_0.xsd, it means that configuration with configuration are handled as invalid and configuration which has authentication-client as root element as valid
• XSD elytron-1_0.xsd includes some elements on the highest level of XSD, which for example means that configuration file which includes only element <set-user-name name="someUser"/> is valid according to XSD.

We request blocker because validated configuration file will not work correctly in clients. Moreover XSD is source of information which can be used by users for creating wildfly-config.xml correctly or validate their configuration file before using it. Mentioned issues can cause that this validation using elytron-1_0.xsd becomes unusable for users.