Resource Factories

<res:audio-factory id="foo" baseURL="bar" extension="bla" abstract="xyz" parent="abc"/>

<res:prompt id="foo" audio-factory="foo">
      <res:audio path="a/b">This is the audio's TTS</res:audio>
      <res:audio path="a/c">This is some more TTS</res:audio>
</res:prompt>

Factory is a bean and therefore injectable:

public class DynamicMenuCreator {

    @Autowire
    @Qualifier(
    public void setPromptFactory(PromptFactory promptFactory) {
         Audio someAudio = promptFactory.create("someAudio", "The TTS equivalent");
    }

}

In the VXML:

<e:prompt id="foo"></e:prompt>
<prompt>
       <e:audio factory="foo" path="foo/bar" extension="bla" fetchtimeout="20s">Some audio!</e:audio>
</prompt>