You are looking at documentation for an older release. Not what you want? See the current release documentation.
To be effective, the namespace URI
http://www.exoplatform.org/xml/ns/kernel_1_2.xsd must be target
namespace of the XML configuration file.
<configuration xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.exoplatform.org/xml/ns/kernel_1_2.xsd http://www.exoplatform.org/xml/ns/kernel_1_2.xsd"
xmlns="http://www.exoplatform.org/xml/ns/kernel_1_2.xsd">
...
</configuration>