elytron-client-1.1.xsd xsd:all minOccurs="0"

I am getting error in my IDE during xml validation

• cvc-complex-type.2.4.b: The content of element 'providers' is not complete. One of '{"urn:elytron:client:1.1":global}' is expected.
  

  While having this snippet in my wildfly-config.xml

  wildfly-config.xml

  <providers>
      <use-service-loader/>
  </providers>
  

• cvc-complex-type.2.4.b: The content of element 'configuration' is not complete. One of '{"urn:elytron:client:
   1.1":set-host, "urn:elytron:client:1.1":set-port, "urn:elytron:client:1.1":set-protocol, "urn:elytron:client:
   1.1":abstract-user-spec, "urn:elytron:client:1.1":set-mechanism-realm, "urn:elytron:client:1.1":rewrite-user-
   name-regex, "urn:elytron:client:1.1":set-mechanism-properties, "urn:elytron:client:1.1":set-authorization-
   name, "urn:elytron:client:1.1":abstract-sasl-factories}' is expected.
  

  While having this snippet in my wildfly-config.xml

  wildfly-config.xml

      <configuration name="default">
          <sasl-mechanism-selector selector="EXTERNAL"/>
          <credentials>
              <key-store-reference key-store-name="keystore">
                  <key-store-clear-password password="${password}"/>
              </key-store-reference>
          </credentials>
          <providers>
              <use-service-loader/>
          </providers>
      </configuration>
  

Based on [1] I think elements in xsd:all should contain minOccurs="0" explicitly. E.g. <xsd:element ref="abstract-user-spec" minOccurs="0"/>.

I see this problem in providers-type and authentication-configuration-type , key-pair-type and certificate-type

[1] https://www.w3schools.com/xml/el_all.asp