XML validation against XSD: schemaLocation value must have even number of URI's

Question

I have a blog.xml and a Blog.xsd to validate the XML file. I am using http://www.xmlvalidation.com/?L=0 to validate both files but I'm getting an error.

Can you kindly tell me whats wrong?

Error:

blog.xml:

http://pastebin.com/He3xCxxC (sorry had to post it to pastebin (Due to SO's word limit)

Blog.xsd:

<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="blog">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="post" maxOccurs="unbounded" minOccurs="0">
          <xs:complexType>
            <xs:sequence>
              <xs:element type="xs:string" name="ptitle"/>
              <xs:element type="xs:string" name="psubtitle"/>
              <xs:element type="xs:anyURI" name="image"/>
              <xs:element type="xs:string" name="author"/>
              <xs:element type="xs:string" name="date"/>
              <xs:element type="xs:string" name="par"/>
              <xs:element type="xs:anyURI" name="source"/>
              <xs:element type="xs:string" name="comments"/>
            </xs:sequence>
            <xs:attribute type="xs:byte" name="id" use="optional"/>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

Answer 1

You have not set the targetNamespace (ie "http://www.w3schools.com") of the schema.

<xs:schema attributeFormDefault="unqualified" targetNamespace="http://www.w3schools.com" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">

And schemalocation must specify the namespace and the schema. This is why you must have an even number of elements in schemaLocation.

<a:blog xmlns:a="http://www.w3schools.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.w3schools.com ./Blog.xsd">