You are looking at documentation for an older release. Not what you want? See the current release documentation.
The following configuration is mandatory for JCR to work correctly (this is done in the add-on already):
<external-component-plugins>
<target-component>org.exoplatform.services.jcr.RepositoryService</target-component>
<component-plugin>
<name>add.namespaces</name>
<set-method>addPlugin</set-method>
<type>org.exoplatform.services.jcr.impl.AddNamespacesPlugin</type>
<init-params>
<properties-param>
<name>namespaces</name>
<property name="cmis" value="http://www.exoplatform.com/jcr/cmis/1.0"/>
<property name="xcmis" value="http://www.exoplatform.com/jcr/xcmis/1.0"/>
</properties-param>
</init-params>
</component-plugin>
<component-plugin>
<name>add.nodeType</name>
<set-method>addPlugin</set-method>
<type>org.exoplatform.services.jcr.impl.AddNodeTypePlugin</type>
<init-params>
<values-param>
<name>autoCreatedInNewRepository</name>
<description>Node types configuration file</description>
<value>jar:/conf/cmis-nodetypes-config.xml</value>
</values-param>
</init-params>
</component-plugin>
</external-component-plugins>