Updated 2020a doc and xsd

documentation/XML_commonRoad_XSD_2020a.xsd

@@ -551,7 +551,7 @@ __status__ = "released"
       <xs:element name="federalState" type="federalState"/>
       <xs:element name="gpsLatitude" type="xs:decimal"/>
       <xs:element name="gpsLongitude" type="xs:decimal"/>
-      <xs:element name="zipcode" type="xs:string"/>
+      <xs:element name="zipcode" type="xs:string" minOccurs="0"/>
       <xs:element name="name" type="xs:string" minOccurs="0"/>
       <xs:element name="geoTransformation" type="geoTransformation" minOccurs="0"/>
     </xs:sequence>
@@ -591,7 +591,7 @@ __status__ = "released"
   <xs:element name="commonRoad">
     <xs:complexType>
       <xs:sequence>
-	<xs:element name="location" type="location" minOccurs="0"/>
+	<xs:element name="location" type="location"/>
 	<xs:element name="scenarioTags" type="tag"/>
         <xs:element name="lanelet" type="lanelet" minOccurs="1" maxOccurs="unbounded"/>
         <xs:element name="trafficSign" type="trafficSign" minOccurs="0" maxOccurs="unbounded"/>