As Gábor already mentioned, it's there (Axis2) and it even ships with Single User Edition of 3.3, only that you cannot use it with SU.
You can create a Axis2 component in CRR and press F1 and then you can dive into all the documentation (which is I think half a page for Axis2 alltogether).
Webservices with XPA and status of Systinet is a bit unclear, cause XPI 4.7 I think still would install Systinet (or Tomcat) and XPC is node.js anyways. Tomcat you could also get working with XPA, there's a requester, ... . Besides there's also another undocumented feature re webservices in Xpa: WCF (.NET) and some other stuff.
The idea behind not providing any documentation and/or samples is I think to keep the MSE consultants busy cause MSE is a PS organization anyways meanwhile (basically, imho).