truststore-Type attribute of element server-sslType should be named truststore-type in XSD. Wildfly configuration parser works with truststore-type, but for example eclipse xml validator complains when truststore-type is used in configuration file.

On the other side when truststore-Type (comply to XSD) is used, wildfly configuration parser starts to complain:

[Host Controller] 14:49:21,822 ERROR [org.jboss.as.host.controller] (Controller Boot Thread) WFLYHC0033: Caught exception during boot: org.jboss.as.controller.persistence.ConfigurationPersistenceException: WFLYCTL0085: Failed to parse configuration
[Host Controller] at org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:131)
[Host Controller] at org.jboss.as.host.controller.HostControllerConfigurationPersister.load(HostControllerConfigurationPersister.java:188)
[Host Controller] at org.jboss.as.host.controller.DomainModelControllerService.boot(DomainModelControllerService.java:585)
[Host Controller] at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:299)
[Host Controller] at java.lang.Thread.run(Thread.java:745)
[Host Controller] Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[110,13]
[Host Controller] Message: WFLYCTL0197: Unexpected attribute 'truststore-Type' encountered
[Host Controller] at org.jboss.as.controller.parsing.ParseUtils.unexpectedAttribute(ParseUtils.java:117)
[Host Controller] at org.jboss.as.host.controller.parsing.HostXml_4.parseServerSsl(HostXml_4.java:1271)
[Host Controller] at org.jboss.as.host.controller.parsing.HostXml_4.parseServerContent(HostXml_4.java:1131)
[Host Controller] at org.jboss.as.host.controller.parsing.HostXml_4.parseServer(HostXml_4.java:1088)
[Host Controller] at org.jboss.as.host.controller.parsing.HostXml_4.parseServers(HostXml_4.java:1071)
[Host Controller] at org.jboss.as.host.controller.parsing.HostXml_4.readHostElement(HostXml_4.java:388)
[Host Controller] at org.jboss.as.host.controller.parsing.HostXml_4.readElement(HostXml_4.java:170)
[Host Controller] at org.jboss.as.host.controller.parsing.HostXml.readElement(HostXml.java:79)
[Host Controller] at org.jboss.as.host.controller.parsing.HostXml.readElement(HostXml.java:50)
[Host Controller] at org.jboss.staxmapper.XMLMapperImpl.processNested(XMLMapperImpl.java:110)
[Host Controller] at org.jboss.staxmapper.XMLMapperImpl.parseDocument(XMLMapperImpl.java:69)
[Host Controller] at org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:123)
[Host Controller] ... 4 more
[Host Controller]
[Host Controller] 14:49:21,823 FATAL [org.jboss.as.host.controller] (Controller Boot Thread) WFLYHC0034: Host Controller boot has failed in an unrecoverable manner; exiting. See previous messages for details