Old code:

<?xml version="1.0" encoding="utf-8" ?>
<Defs>

<ThingDef Name="ArtificialSmoothWall" ParentName="BuildingBase">
<defName>ArtificialSmoothWall</defName>
<label>smooth wall</label>
<description>A smooth wall, just like in the mountian fortresses back home.</description>
<thingClass>Building</thingClass>
<category>Building</category>
<graphicData>
<texPath>Things/Building/Linked/RockSmooth_Atlas</texPath>
<graphicClass>Graphic_Single</graphicClass>
<linkType>CornerFiller</linkType>
<linkFlags>
<li>Rock</li>
<li>Wall</li>
</linkFlags>
<damageData>
<cornerTL>Damage/Corner</cornerTL>
<cornerTR>Damage/Corner</cornerTR>
<cornerBL>Damage/Corner</cornerBL>
<cornerBR>Damage/Corner</cornerBR>
<edgeTop>Damage/Edge</edgeTop>
<edgeBot>Damage/Edge</edgeBot>
<edgeLeft>Damage/Edge</edgeLeft>
<edgeRight>Damage/Edge</edgeRight>
</damageData>
</graphicData>
<uiIconPath>Things/Building/Linked/WallSmooth_MenuIcon</uiIconPath>
<altitudeLayer>Building</altitudeLayer>
<passability>Impassable</passability>
<blockWind>true</blockWind>
<castEdgeShadows>true</castEdgeShadows>
<fillPercent>1</fillPercent>
<coversFloor>true</coversFloor>
<placingDraggableDimensions>1</placingDraggableDimensions>
<neverMultiSelect>true</neverMultiSelect>
<tickerType>Never</tickerType>
<rotatable>false</rotatable>
<selectable>true</selectable>
<saveCompressible>false</saveCompressible>
<terrainAffordanceNeeded>Heavy</terrainAffordanceNeeded>
<holdsRoof>true</holdsRoof>
<designationCategory>Structure</designationCategory>
<staticSunShadowHeight>1.0</staticSunShadowHeight>
<blockLight>true</blockLight>
<canOverlapZones>false</canOverlapZones>
<mineable>false</mineable>
<statBases>
<MaxHitPoints>300</MaxHitPoints>
<WorkToBuild>135</WorkToBuild>
<Flammability>1.0</Flammability>
</statBases>
<costStuffCount>5</costStuffCount>
<stuffCategories>
<li>Woody</li>
<li>Stony</li>
<li>Metallic</li>
</stuffCategories>
<repairEffect>Repair</repairEffect>
<damageMultipliers>
<li>
<damageDef>Bomb</damageDef>
<multiplier>2</multiplier>
</li>
</damageMultipliers>
<leaveResourcesWhenKilled>false</leaveResourcesWhenKilled>
<building>
<isInert>true</isInert>
<isNaturalRock>false</isNaturalRock>
<ai_chillDestination>false</ai_chillDestination>
<deconstructible>true</deconstructible>
<blueprintGraphicData>
<texPath>Things/Building/Linked/Wall_Blueprint_Atlas</texPath>
</blueprintGraphicData>
</building>
<designationHotKey>Misc3</designationHotKey>
</ThingDef>

</Defs>