amended xsd by the ratecuroff with optional but max 1 times occurance

Author: Borgomi42

xsd/conventions.xsd

@@ -105,6 +105,7 @@
       <xs:element type="businessDayConvention" name="FixedPaymentConvention" minOccurs="0" maxOccurs="1"/>
       <xs:element type="dateRule" name="Rule" minOccurs="0" maxOccurs="1"/>
       <xs:element type="xs:string" name="PaymentCalendar" minOccurs="0" maxOccurs="1"/>
+      <xs:element type="xs:integer" name="RateCutoff" minOccurs="0" maxOccurs="1"/>
     </xs:all>
   </xs:complexType>