diff --git a/doctrine-mapping.xsd b/doctrine-mapping.xsd
index f3bea4f8e..e74010a8e 100644
--- a/doctrine-mapping.xsd
+++ b/doctrine-mapping.xsd
@@ -173,12 +173,19 @@
   <xs:complexType name="id">
     <xs:sequence>
       <xs:element name="generator" type="orm:generator" minOccurs="0" />
+      <xs:element name="sequence-generator" type="orm:sequence-generator" minOccurs="0" maxOccurs="1" />
     </xs:sequence>
     <xs:attribute name="name" type="xs:NMTOKEN" use="required" />
     <xs:attribute name="type" type="xs:NMTOKEN" use="required" />
     <xs:attribute name="column" type="xs:NMTOKEN" />
   </xs:complexType>
 
+  <xs:complexType name="sequence-generator">
+      <xs:attribute name="sequence-name" type="xs:NMTOKEN" use="required" />
+      <xs:attribute name="allocation-size" type="xs:integer" use="optional" default="1" />
+      <xs:attribute name="initial-value" type="xs:integer" use="optional" default="1" />
+  </xs:complexType>
+
   <xs:complexType name="inverse-join-columns">
     <xs:sequence>
       <xs:element name="join-column" type="orm:join-column" minOccurs="1" maxOccurs="unbounded" />