The XML-oriented WildFly modules will be merged into one module using
the standard "java.xml" name, containing all the types found here [1],
with the old "javax.xml.*" modules being deprecated.  The "javax.api"
module is being deprecated in favor of standard Java module names
which should be usable by WildFly 13, and upstream within the next
week or two.  For more information see [2], [3], and other related
(linked) JIRAs.