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A fixed number of units can be specified using the length facet

<?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"   targetNamespace="http://www.rntsoft.com" xmlns="http://www.rntsoft.com"   elementFormDefault="qualified">   <xs:simpleType name="USA_SSN">     <xs:restriction base="xs:string">       <xs:length value="11" />     </xs:restriction>   </xs:simpleType> </xs:schema> Any of the following values would therefore, be valid for an ssn element that uses the USA_SSN datatype:  <ssn>123-45-6789</ssn> <ssn>abcdefghijk</ssn> <ssn>$   2345.42</ssn>