delphi - How to create xml based on this xsd? -

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i have xsd , trying create xml file using nativexml (delphi).

<xs:element maxoccurs="unbounded" name="program">  <xs:complextype>   <xs:attribute name="provider" use="required">    <xs:simpletype>     <xs:restriction base="xs:string">      <xs:minlength value="2" />      <xs:maxlength value="6" />     </xs:restriction>    </xs:simpletype>   </xs:attribute>   <xs:more attributes\>  </xs:complextype> </xs:element>

i created following code: 

node := adoc.root.nodenew('student'); node.writeattributeinteger('provider',var_with_data);

how can create restrictions?


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