Compared to Enabling Dynamic Templates in GMF, the EMF approach
uses sometime uses the JET language instead of Xpand, so it is not possible to use an aspect-oriented to modify the generated model; instead, we have to copy the entire template verbatim and use this.
In some cases, templates can include a sub-template, allowing us to insert code directly:
<%@ include file="Class/insert.javajetinc" fail="silent" %>
To implement, follow the instructions in the EMF FAQ.