need help on making CE patch with xpath

[Faryzal2020]

i want to make a CE patch for my mod but i got confused by this. so basicly there's this thingdef for an ammunition


i want to convert it into CE format like this with xpath


how do i add the Class="CombatExtended.AmmoDef" and change the ParentName with xpath?

[Mehni]

how do i add the Class="CombatExtended.AmmoDef" [...] with xpath?

PatchOperationAttributeAdd

how do i [...] change the ParentName with xpath?

PatchOperationAttributeSet