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Predefining an Attributes Content with a fixed value or a default value

File: Schema.xsd   <?xml version="1.0" ?> <schema xmlns="http://www.w3.org/2001/10/XMLSchema" targetNamespace="http://www.rntsoft.comns/" xmlns:end="http://www.rntsoft.com/">     <xsd:element name="source">         <xsd:complexType>             <xsd:complexContent>                 <xsd:extension base="xsd:anyType">                     <xsd:attribute name="sectionid" type="xsd:string" use="required"/>                     <xsd:attribute name="newspaperid" type="xsd:string"/>                 </xsd:extension>             </xsd:complexContent>         </xsd:complexType>     </xsd:element> </schema>  File: Data.xml <?xml version="1.0"?>  <source sectionid="101"/>   File: Data.xml <?xml version="1.0"?> <source sectionid="101" newspaperid="21"/>