What is ServiceData.xml for ?

Hello:

I'm using Axis2 1.6.2 and sometimes I see this log message:

DEBUG http-8080-2 org.apache.axiom.om.impl.MTOMXMLStreamWriter -
Calling MTOMXMLStreamWriter.flush
 DEBUG http-8080-2 org.apache.axis2.dataretrieval.DataRetrievalUtil -
File does not exist in the Service Repository!
File=META-INF/ServiceData.xml
 DEBUG http-8080-2 org.apache.axis2.dataretrieval.AxisDataLocatorImpl
- Check loading failure for file, META-INF/ServiceData.xml.Message =
Failed to load from file, META-INF/ServiceData.xml
 DEBUG http-8080-2 org.apache.axis2.dataretrieval.AxisDataLocatorImpl
- Check loading failure for file, META-INF/ServiceData.xml
 org.apache.axis2.dataretrieval.DataRetrievalException: Failed to load
from file, META-INF/ServiceData.xml
        at org.apache.axis2.dataretrieval.DataRetrievalUtil.buildOM(DataRetrievalUtil.java:60)
        at org.apache.axis2.dataretrieval.AxisDataLocatorImpl.loadServiceData(AxisDataLocatorImpl.java:104)
        at org.apache.axis2.description.AxisService.getDefaultDataLocator(AxisService.java:3052)
        at org.apache.axis2.description.AxisService.getDataLocator(AxisService.java:3036)
        at org.apache.axis2.description.AxisService.getData(AxisService.java:2953)
        at org.apache.axis2.description.AxisService.getWSDL(AxisService.java:1645)
        at org.apache.axis2.description.AxisService.printWSDL(AxisService.java:1413)
        at org.apache.axis2.transport.http.ListingAgent.handleWSDLRequest(ListingAgent.java:327)
        at org.apache.axis2.transport.http.ListingAgent.processListService(ListingAgent.java:183)
        at org.apache.axis2.transport.http.AxisServlet.doGet(AxisServlet.java:260)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at com.googlecode.psiprobe.Tomcat60AgentValve.invoke(Tomcat60AgentValve.java:30)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:722)
Caused by: javax.xml.stream.XMLStreamException: File does not exist in
the Service Repository! File=META-INF/ServiceData.xml
        at org.apache.axis2.dataretrieval.DataRetrievalUtil.getInputStream(DataRetrievalUtil.java:95)
        at org.apache.axis2.dataretrieval.DataRetrievalUtil.buildOM(DataRetrievalUtil.java:56)
        ... 24 more


I don't know what is this file for and I've found any info about it
I deploy my services as .aar files and this files doesn't contain any
ServiceData.xml

is it required ? for what ?
how i must define it ?

Thanks and regards