XML/XML Schema/gDay

xs:minInclusive defines a minimum value that can be reached based on gDay

   <source lang="xml">

<?xml version="1.0"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"

 targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
 elementFormDefault="qualified">
 <xsd:element name="data" type="afterOrOnThe20th"/>
 <xsd:simpleType name="afterOrOnThe20th">
   <xsd:restriction base="xsd:gDay">
     <xsd:minInclusive value="---20" />
   </xsd:restriction>
 </xsd:simpleType>

</xsd:schema>

</source>