diff --git a/pom/src/plugin-resources/xsd/pom-strict-3.xsd b/pom/src/plugin-resources/xsd/pom-strict-3.xsd
index 56a7254f..8ad14d86 100644
--- a/pom/src/plugin-resources/xsd/pom-strict-3.xsd
+++ b/pom/src/plugin-resources/xsd/pom-strict-3.xsd
@@ -294,7 +294,7 @@
 
         <xs:complexType>
           <xs:sequence>
-            <xs:element maxOccurs="unbounded" name="developer"
+            <xs:element minOccurs="0" maxOccurs="unbounded" name="developer"
                         type="Developer"/>
           </xs:sequence>
         </xs:complexType>
@@ -312,7 +312,7 @@
 
         <xs:complexType>
           <xs:sequence>
-            <xs:element maxOccurs="unbounded" name="contributor"
+            <xs:element minOccurs="0" maxOccurs="unbounded" name="contributor"
                         type="Contributor"/>
           </xs:sequence>
         </xs:complexType>