I'm coming around to the idea that we can't handle all of the dependency tracking with a specialized map. But, I'm wondering if we can come up with an approach that still leverages maps for the dependencies they express and supports the continuum of approaches.

Proposal: We introduce a new kind of XML document that identifies the source files belonging to an information set. The basic structure is very simple:

<infoset>
    <data ...> ... </data>
    ... more data about this infoset ...

    <source href="filename" modified="2006-5-2 20:05:01">
        <data ...> ... </data>
        ... more data about this source ...
    </source>

    ... more sources ...

</infoset>

The <data> element would be the same as DITA 1.1 for cognitive reuse if nothing else.

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