DMV to list table relationships in a Power Pivot model ?

I have used different queries based on DMVs which let you extract data from a Power Pivot model in order to create a design documentation: list of tables, columns, calculated columns formulas, measures ...etc. 
Yet, I have not found the way to extract a list of all tables relationships in the model. Sure enough, I can copy/paste it from the PowerPivot window.
But would someone have a query that extracts table relationships ?
Regards,
Bertrand 

I do not believe that there is any $system based DMV which returns relationship information.
You can get this information from an SSAS Tabular instance using a DISCOVER_CSDL_METADATA call, but that returns an XML document with the all the metadata and I don't know of any easy way to call that against a PowerPivot model (unless it's deployed to sharepoint)
The following is an example query that I ran against a tabular SSAS instance.
<Discover xmlns="urn:schemas-microsoft-com:xml-analysis">
<RequestType>DISCOVER_CSDL_METADATA</RequestType>
    <Restrictions>
<RestrictionList>
<CATALOG_NAME>Adventure Works Tabular</CATALOG_NAME>
<PERSPECTIVE_NAME>Model</PERSPECTIVE_NAME>
<VERSION>1.2</VERSION>
</RestrictionList>
</Restrictions>
    <Properties>
<PropertyList>
<Catalog>Adventure Works Tabular</Catalog>
<FORMAT>Tabular</FORMAT>
    </PropertyList>
</Properties>
</Discover>
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