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Hi guys, Hope you are fine.
This is an example of what i want to do but idk why it does not work.
<Patch>
   <Operation Class="PatchOperationAdd">
     <xpath>/ThingDefs/ThingDef[defName = "SleepingSpot"]</xpath>
     <value>
    <researchPrerequisites><li>HospitalBed</li></researchPrerequisites>
     </value>
   </Operation>
</Patch>

I want to add research prerequisites to some things but i cant make it work.