Add Implement hot aisle cold aisle design

BuildingSync.xsd

@@ -4312,6 +4312,7 @@
                             <xs:restriction base="xs:string">
                               <xs:enumeration value="Improve data center efficiency"/>
                               <xs:enumeration value="Implement hot aisle hold aisle design"/>
+                              <xs:enumeration value="Implement hot aisle cold aisle design"/>
                               <xs:enumeration value="Implement server virtualization"/>
                               <xs:enumeration value="Upgrade servers"/>
                               <xs:enumeration value="Clean and/or repair"/>

proposals/2021/Fix Implement hot aisle cold aisle design.md

@@ -0,0 +1,14 @@
+# Fix Implement hot aisle cold aisle design
+
+## Overview
+
+This proposal is to fix the typo in enumeration `Implement hot aisle cold aisle design` under element `auc:DataCenterImprovements`.
+
+## Justification
+
+Currently in version 2.4, the enumeration is mistakenly written as `Implement hot aisle hold aisle design`. To avoid breaking change, we will add the correct enumeration in version 2.5 and delete the wrong one in version 3.0.
+
+## Implementation
+Add enumeration `Implement hot aisle cold aisle design` under element `auc:DataCenterImprovements`.
+
+## References