How to use ElemCallTemplate?

I'm trying to write an extension element which calls a template with content
I generate.
The problem is if I use...

        TransformerImpl transf = context.getTransformer ();
        String name =
            elem.getAttribute ( "name", context.getContextNode (), transf );
        ElemCallTemplate ect = new ElemCallTemplate();
        ect.setName( new QName(name) );
        ect.execute( transf );

the message I get is 'Could not find template named:'
Using the xslt call-template with the same template name seems to work fine. 
What is the difference - or am I missing how to use the ElemCallTemplate?
Nigel


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