diff --git a/doctrine-mapping.xsd b/doctrine-mapping.xsd
index bb8624190..c0c2d4623 100644
--- a/doctrine-mapping.xsd
+++ b/doctrine-mapping.xsd
@@ -191,7 +191,7 @@
       <xs:any minOccurs="0" maxOccurs="unbounded" namespace="##other"/>
     </xs:sequence>
     <xs:attribute name="name" type="xs:string" use="required" />
-    <xs:attribute name="table" type="xs:NMTOKEN" />
+    <xs:attribute name="table" type="orm:tablename" />
     <xs:attribute name="schema" type="xs:NMTOKEN" />
     <xs:attribute name="repository-class" type="xs:string"/>
     <xs:attribute name="inheritance-type" type="orm:inheritance-type"/>
@@ -200,6 +200,13 @@
     <xs:anyAttribute namespace="##other"/>
   </xs:complexType>
 
+  <xs:simpleType name="tablename" id="tablename">
+    <xs:restriction base="xs:token">
+      <xs:pattern value="[a-zA-Z_u01-uff.]+" id="tablename.pattern">
+      </xs:pattern>
+    </xs:restriction>
+  </xs:simpleType>
+
   <xs:complexType name="option" mixed="true">
     <xs:sequence minOccurs="0" maxOccurs="unbounded">
       <xs:element name="option" type="orm:option"/>