--- a/metadata.xsd	
+++ a/metadata.xsd	
@@ -270,6 +270,7 @@ 
 
 	<xs:simpleType name='upstreamRemoteIdTypeAttrType'>
 		<xs:restriction base='xs:token'>
+			<xs:enumeration value='apache'/>
 			<xs:enumeration value='bitbucket'/>
 			<xs:enumeration value='cpan'/>
 			<xs:enumeration value='cpan-module'/>