Invalid XDocument is getting validated

Question

I have following xml schema

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" attributeFormDefault="unqualified" elementFormDefault="qualified" 
           targetNamespace="http://www.MySchema.net" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="RootElement">
    <xs:complexType>
      <xs:simpleContent>
        <xs:extension base="xs:string">
          <xs:attribute name="name" type="xs:string" />
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>
  </xs:element>
</xs:schema>

and following xml's are validated against above schema:

Case 1: (Schema exception)

<?xml version="1.0" encoding="utf-8" ?> <RootElement11 name="Configuration" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.MySchema.net Root" xmlns="http://www.MySchema.net">
    </RootElement11>

Case 2: (No exception)

<?xml version="1.0" encoding="utf-8" ?>
<RootElement11 name="Configuration" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.YourSchema.net Root" xmlns="http://www.YourSchema.net">
</RootElement11>

Case 3: (No exception)

<RootElement11 name="Configuration">
</RootElement11>

For Case 1, I get an expected exception that "The 'http://www.MySchema.net:RootElement1' element is not declared.", but Case 2 and Case 3 are validated without exception.

I wanted to know if there is a possibility to throw an exception when xml files with false namespaces or without namespaces are validated using XDocument.Validate method.

I found some info which use XmlReader with settings to throw these type of exception. I see two possibilites 1) Get back to XmlReader from XDocument, 2) Validate using XmlReader and use XDocument to do LINQ queries. But is it possible to accomplish this without XmlReader.

I would create an extension method for XDocument, and in that method use XmlReader over XDocument.CreateReader for validation. So basically 2nd method. — Evk, May 18 '16 at 16:10
Possible duplicate of [XDocument.Validate is always successful](http://stackoverflow.com/questions/17232575/xdocument-validate-is-always-successful) — Charles Mager, May 18 '16 at 16:11

score 2 · Accepted Answer · edited May 23 '17 at 12:16

The issue is that both cases 2 and 3 are valid per the schema - your schema doesn't have any opinion on elements in namespaces other than its targetNamespace.

XmlReader can return a warning for this, but there's no overload for XDocument that will do it. The snippet in your linked question uses an XmlReader wrapper around XDocument, I can't see why you'd have any issue with doing it this way.

Invalid XDocument is getting validated

1 Answers1

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