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Tapestry IOC makes use of runtime-evaluated symbols to handle certains certain types of configuration tasks.

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  public static MyService build(
      @InjectService("${some-service-id}") Collaborator collab)
  {
    return . . . ;
  }

Here, the symbol name, some-service-id is a service id, such as WackyCollaborator.

Although not shown here, it is possible to use multple multiple symbols inside the string, or mix literal text with symbols.

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