If the HIEOS is deployed correctly within the Glassfish the service endpoint provides a wsdl definition where the interface is specified. Check the Glassfish for the wsdl of the service.
http://localhost:8080/my-ws/simple?WSDL
Quelle: docs.oracle.com/cd/E18930_01/html/821-2418/gbiyw.html
The list of provided endpoints you can see here:
https://kenai.com/projects/hieos/pages/WebServices
So to retrieve the wsdl you should use for example:
http://localhost:8080/axis2/services/xdsrepositoryb?wsdl
which applies for the ProvideAndRegisterDocumentSet-b transaction of the XDS Repository actor.
You can use the WSDL definition to create a WS request using SOAP UI at first.

SOAP UI creates a request based upon the wsdl definition which can be used to
test a against your XDS repo.
When you know how a SOAP request must be constructed you can try it using Mirth or
create your own client using Apache CXF http://cxf.apache.org/ for example.
Or you use AXIS2 to create a client from the WSDL. Of course does Visual Studio and C# also offer mechanisms to create a WS client directly from a WSDL definition.