Mod - Multiple Traits Problems

[psychok9]

Can I build Burial tomb earlier? This doesn't works:

<GameData>
          <Buildings>
		<Update>
			<Set Happiness="2"/>
			<Where Type="BUILDING_BURIAL_TOMB"/>
		</Update>
		<Update>
			<Set PrereqTech="TECH_AGRICULTURE"/>
			<Where Type="BUILDING_BURIAL_TOMB"/>
		</Update>
		<Update>
			<Set PrereqTech="TECH_AGRICULTURE"/>
			<Where Type="BUILDING_TEMPLE"/>
		</Update>
	</Buildings>
</GameData>