Creating a Linked Data View
By completing the preceding exercise, you have created a data source in your site that combines the Posts list with the Comments list. However, the two lists do not have an explicit relationship; they have an implicit one. When creating a view that includes some data from one list and some data from a linked list, you should always insert the view in two steps: First insert the "parent" data values, and then select the "child" values and insert them as a subview. Trying to create the view in one step causes the subview to render incorrectly.
In this exercise, you will create a view of the Posts list and then insert a subview of the Comments list. You will then use the XPath Expression Builder dialog box to show the average ...
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