Using DataSets across frames

I have an XML DS defined in an object on a frameset page.
(shell.myDS)
I can pull data from this dataset by using
parent.shell.myDS.getData().
However, if in a child frame I try to create a Nested
DataSet, it fails. If I try to create a Spry Region in the child
frame that references the parent DataSet, it fails as well.
Can this be done at all, or is it a limitation?

My own dumb fault.
1.) I didn't add the spry namespace to the page being used in
the child frame. Doh!
2.) In order for a region to use a DataSet from another frame
(or defined in another object, it needs a reference to it that
doesn't have a . in th name.
e.g.
This won't work:
<spry:region="parent.shell.myDataSet">
but this will:
var ds = parent.shell.myDataSet;
<spry region="ds">

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