XSD and Schema Validation

Consider the following XML document:

 
        <?xml version="1.0"?>
        <customers>
            <customer id="1" status="active">
                <firstname>Jack</firstname>
                <lastname>Smith</lastname>
            </customer>
            <customer id="1" status="archived">
                <firstname>Tom</firstname>
                <lastname>James</lastname>
            </customer>
        </customers>
  

We can write an XSD for this document as follows:

 
    <?xml version="1.0" encoding="utf-8"?>
    <xs:schema attributeFormDefault="unqualified" 
               elementFormDefault="qualified" 
               xmlns:xs="http://www.w3.org/2001/XMLSchema">
        <xs:element name="customers">
            <xs:complexType>
                <xs:sequence>
                    <xs:element maxOccurs="unbounded" name="customer">
                        <xs:complexType>
                            <xs:sequence>
                                <xs:element name="firstname" type="xs:string" />
                                <xs:element name="lastname" type="xs:string" />
                            </xs:sequence>
                            <xs:attribute name="id" type="xs:int" use="required" />
                            <xs:attribute name="status" type="xs:string" use="required" />
                        </xs:complexType>
                    </xs:element>
                </xs:sequence>
            </xs:complexType>
        </xs:element>
    </xs:schema>
  

Validating with an XmlReader

Here's how to plug a schema from the file customers.xsd into an XmlReader:


using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using System.Text;
using System.IO;
class Program
{
    static void Main()
    {

        XmlReaderSettings settings = new XmlReaderSettings(); 
        settings.ValidationType = ValidationType.Schema; 
        settings.Schemas.Add(null, "customers.xsd");

        XmlReader r = XmlReader.Create("customers.xml", settings);
    }
}
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