wix - Creating Element as first item within another element using Wxs (Windows Installer) -


i using wix installer application , 1 of scenarios trying handle changes .config file when application upgraded. essentially, want add xml element within xml element. instance, original .config file shipped application looked 

<root-element>   <sub-element-1/>   <sub-element-2/> </root-element>

during app lifetime, updated below @ point. 

<root-element>   <sub-element-0/>   <sub-element-1/>   <sub-element-2/> </root-element>

for handling case , need add <sub-element-0/> under <root-element>, tried wxs code.

<util:xmlfile id="myconfig"     file="[fileidofmyconfigfile]"    action="createelement"    name="sub-element-0"    elementpath="root-element"     sequence="1"/>

the above formulation add sub-element-0 under root-element , last item under root-element. 

<root-element>   <sub-element-1/>   <sub-element-2/>   <sub-element-0/> </root-element>

i couldn't find resources on adding first element want be. suggestions on how accomplished?

note: above simplified version of use case. reason order important in case due limitation on framework elements need occur before other elements in .config


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