Index: trunk/data/maps.xsd
===================================================================
--- trunk/data/maps.xsd	(revision 14534)
+++ trunk/data/maps.xsd	(revision 14541)
@@ -681,5 +681,5 @@
                             <!-- The image category, don't use enumeration, so future extension is possible -->
                             <!-- Currently defined values are: "photo", "map", "historicmap", "osmbasedmap", "historicphoto" and "other" -->
-                            <xs:element name="category" minOccurs="0" maxOccurs="1" type="xs:string" />
+                            <xs:element name="category" minOccurs="1" maxOccurs="1" type="xs:string" />
                             <!-- The ISO 3166 country code -->
                             <xs:element name="country-code" minOccurs="0" maxOccurs="1" type="tns:iso3166" />