XML
http://pastebin.com/237ss57y

Schema
http://pastebin.com/wikZzZsq

Enjoy

ps : InstallationCost doesn't have his extension points set since it depends on your attributes.

Quick sample :

<extension>
        <name>Accelerated armor repair</name>
        <group>Engineering</group>
        <complexity>1</complexity>
        <description>Each level of this extension reduces the cycle time of armor repairers and remote armor repairers by an additional 5%.</description>
        <attributes>
            <attribute>Mechatronics</attribute>
            <attribute>Research</attribute>
        </attributes>
        <installationCost>
            <price>5000</price>
            <extensionPoints>0</extensionPoints>
        </installationCost>
        <conditions/>
    </extension>