address.xsd

<?xml version="1.0" encoding="utf-8" ?>
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<xs:schema version="1.0"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           elementFormDefault="qualified">

    <!-- Main instance  -->
    <xs:element name="address">
      <xs:complexType>
        <xs:sequence>
            
          <!-- phone, street, npa, city -->
          <xs:element name="phone" type="xs:string"/>
          <xs:element name="street" type="xs:string"/>
          <xs:element name="npa" type="xs:positiveInteger"/>
          <xs:element name="city" type="xs:string"/>

        </xs:sequence>
      </xs:complexType>
    </xs:element>
    
</xs:schema>