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# Namespace of the layout ruleset

The XML namespace of the layout ruleset is `urn:speedata.de:2009/publisher/en`. The additional XPath functions are in the namespace `urn:speedata:2009/publisher/functions/en`. A layout ruleset should therefore always have this frame:

    <Layout xmlns="urn:speedata.de:2009/publisher/en"
            xmlns:sd="urn:speedata:2009/publisher/functions/en">
     ...
    </Layout>

Then you can call speedata’s own functions with the prefix `sd:`, for example: `sd:current-page()` to determine the current page number.

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