How to make use of the portal service "xsltransform"

Hi all,
I am using EP5 SP4 and is trying to create a component to do xml transformation by using the portal service "xsltransform". However when I run the code (which is reference to an example on web), the following error occured:
javax.naming.NotContextException: broker should be a Context
     at com.sapportals.portal.prt.repository.AbstractHierarchicalContext.lookup(AbstractHierarchicalContext.java:139)
     at com.sapportals.portal.prt.repository.AbstractHierarchicalContext.lookup(AbstractHierarchicalContext.java:140)
     at com.sapportals.portal.prt.repository.AbstractHierarchicalContext.lookup(AbstractHierarchicalContext.java:74)
     at javax.naming.InitialContext.lookup(InitialContext.java:345)
     at com.mk.kmbrowserid.MkKmBrowseRID$MkKmBrowseRIDDynPage.doProcessBeforeOutput(MkKmBrowseRID.java:167)
Here is my code:
Hashtable env = new Hashtable();
     env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sapportals.portal.prt.registry.PortalRegistryFactory");
     InitialContext context = new InitialContext(env);
     IXSLTransformService xslTransService = (IXSLTransformService) context.lookup("/broker/services/"+IXSLTransformService.KEY);
     //retrieve the xsl file and put into string
     String line;
     StringBuffer styleSheet = new StringBuffer();
     IResourceContext resourceContext = new ResourceContext(myUser);
     IResourceFactory resFactory = ResourceFactory.getInstance();
Where the problem is occured in line 167 "IXSLTransformService xslTransService = (IXSLTransformService) context.lookup("/broker/services/"+IXSLTransformService.KEY);"
Do any one know how to solve this problem? And setting / config should be done before the service "xsltransform" can be used?
Thanks
Sam

hi
I need an example please....
did any one use that FM
Regards

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