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Mark attribute as required

File: Schema.xsd <?xml version="1.0" encoding="UTF-8"?> <xs:schema    targetNamespace="http://www.oreilly.com/xslt"    xmlns:xs="http://www.w3.org/2001/XMLSchema"    xmlns="http://www.oreilly.com/xslt">      <xs:element name="part">     <xs:complexType>       <xs:sequence>         <xs:element ref="name" minOccurs="1" maxOccurs="1"/>       </xs:sequence>       <xs:attribute name="part-id" type="xs:ID" use="required"/>     </xs:complexType>   </xs:element>      <xs:element name="name" type="xs:string"/>      <xs:element name="partref">     <xs:complexType>       <xs:attribute name="refid" type="xs:IDREF" use="required"/>     </xs:complexType>   </xs:element> </xs:schema>