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Specifying a Pattern for a Simple Type

<?xml version="1.0"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"   targetNamespace="http://www.rntsoft.com" xmlns="http://www.rntsoft.com"   elementFormDefault="qualified">   <xsd:element name="invoice_number">     <xsd:simpleType>       <xsd:restriction base="xsd:string">         <xsd:pattern value="INV #99\d{3}" />       </xsd:restriction>     </xsd:simpleType>   </xsd:element> </xsd:schema> File: Data.xml  <?xml version="1.0"?> <invoice_number xmlns="http://www.rntsoft.com">INV #99426</invoice_number>