Diagram node ordering in DrawingML

I’m trying to figure out how nodes in a DrawingML Diagram (a.k.a Smart Art) are ordered relative to each other, preferably in Cartesian coordinates or something equivalent.

So far I only identified the data model representation of the nodes, e.g.

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  • <dgm:pt modelId="{B37AE411-71A1-4612-81D5-01390DAF7FEA}">
    <dgm:prSet phldrT="[Text]"/>
                <a:rPr lang="en-US"/>
            <a:endParaRPr lang="ro-RO"/>

    Further below in the same data model file (data1.xml) there is a so-called connection list node, and this is where it gets very cryptic for me:

    <dgm:cxn modelId="{D1DE1A6C-3657-4D5A-AF37-E7E517750042}" srcId="{DA34B220-FCC6-48BF-B991-67739C45390B}" destId="{B3CDFAEE-E041-40CB-8256-D058FD55A699}" srcOrd="1" destOrd="0" parTransId="{0FE02592-27D7-44B2-91B5-6367260264BD}" sibTransId="{6926E681-C956-43CA-9359-DECF92806858}"/>

    The official ECMA-376 specification doesn’t help me much in understanding the actual positioning of the nodes and it certainly does not offer a big picture of how diagrams are expressed in DrawingML. Could anyone please explain this to me or point me to some online resources that do a good job of explaining all?

    UPDATE: i think i may have found some starting points:

    Smart Arts Developer Reference

    This MSDN thread

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