public String applicableNamespace()
    {
        return namespaceName == null ? packageName : namespaceName;
    }
Get the namespaceName to be used for generated code.
<p>
If {@link #namespaceName} is null then {@link #packageName} is used.

@return the namespaceName to be used for generated code.
sbe-tool/src/main/java/uk/co/real_logic/sbe/ir/Ir.java