Update FWEBuilding.xsd

public/FWEBuilding/v2.1/XSD/FWEBuilding.xsd

@@ -14,7 +14,7 @@
           <element minOccurs="0" name="surveyYear" type="integer"/>
           <element maxOccurs="unbounded" minOccurs="0" name="surveyYearVersion" type="double"/>
           <element maxOccurs="unbounded" minOccurs="0" name="surveyDescription" type="string"/>
-          <element minOccurs="0" name="population" type="integer"/>
+          <element minOccurs="0" name="population" type="positiveInteger"/>
           <element minOccurs="0" name="buildingFootprintArea" type="gml:AreaType"/>
           <element minOccurs="0" name="totalFloorArea" type="gml:AreaType"/>
           <element maxOccurs="unbounded" minOccurs="0" name="foodSurvey" type="FWEB:FoodSurveyPropertyType">